Why are Front Brakes Larger than Rear Ones? Brake Bias Explained

If you have ever walked down a street and observed the wheels of parked cars you may have noticed how front brakes are always larger than rear ones. And it's not just the diameter of the brake disc, it's also the brake calipers, which are larger and often have more pistons in the front.
If you had the opportunity to observe brakes of cars with their wheels removed you may also have noticed that front brake discs are usually ventilated whereas rear ones are not.
So why is this the case? Well the answer is that if rear brakes were larger than front ones, braking would often result in your car spinning out of control and likely crashing.
To understand why this would happen we must observe what happens with the car during hard braking. As you can see the front of the car or the nose of the car dives. This happens because of weight transfer.
Weight transfer occurs because of inertia. The car wants to keep going in the same direction but the brakes and the tires are trying to stop it. By doing so they become the point of rotation for the vehicle. A nice way to visualize weight transfer is to imagine a car with a single wheel in the middle. You can imagine how such a vehicle would hit the ground with its nose upon hard brake application. Motorcycles are also great for visualizing weight transfer and the brakes becoming a point of rotation of the vehicle, because this is exactly what happens when a motorcycle performs a stoppie.
Now this weight transfer is an extremely important factor to overall braking performance and it greatly impacts the performance of your tires. Why?
Well that's because weight transfer provides increased grip to front tires.
As you probably know tires keep the car on the road through friction between the rubber and the road surface. But friction is a very fickle phenomenon. Despite what intuition may say, friction is not influenced by surface area. In other words it doesn't matter how you drag a plank across the floor, whether on it's side or on it's face - friction will be the same even if surface area is not the same.
Friction only cares about the force acting on the object, which is usually the weight of the object and the friction coefficient which is determined by the surface roughness of the object material.
So in the case of a car coming to a hard sudden stop the material obviously remains the same but weight does not. Weight transfer puts more weight above the front wheels, in other words the force acting on the wheels pressing them down into the ground has increased. This means that the front tires now have increased friction and thus increased grip available to them.
Now for any brake system to be efficient and safe it must be capable of overcoming the maximum grip potential of the tires. What does this mean? It means that all brakes on all cars made in the past 40 years or so are capable of overpowering the tires. In other words when you slam on the brakes the brakes are strong enough to cause the tires to skid or slide acorss the surface. Now tire skidding is bad news because a tire that is skidding has much less friction than a tire that is still maintaining it's grip on the road. This is why ABS was invented. Using sensors on the wheels the ABS control unit can „see“ when a tire is about to skid. To prevent this from happening the ABS system rapidly releases and grabs the brakes in order to maintain grip and prevent skidding. This is the vibration you feel in the brake pedal when abs engages, it's the rapid releasing and grabbing that the ABS system is performing to achieve maximum braking potential and prevent skidding.
A step up from this can be found on some race-cars and it's a brake proportioning valve that can be controlled by the driver. This means that you can change brake bias on the fly while driving.
But ultimately all of these purely mechanical systems are limited. This is why we invented something known as EBD or Electronic brakeforce distribution. This is a system that is capable of constantly monitoring what is happening to each wheel and constantly changing the amount of brakeforce allocated to each individual wheel. A system like this the optimal way of maximizing braking potential and preventing the under-utilization of rear brakes.
EBD can increase brake force on the rear wheels before weight transfer occurs and then reduce it as weight transfer occurs to prevent the rear from skidding out of control. It can also allocate more brakeforce to the outer rear wheel during cornering because this wheel has more grip and then after weight transfer it can allocate more to the outer front wheel to maximize braking.
A special thank you to my patrons:
Daniel
Pepe
Brian Alvarez
Peter Della Flora
Dave Westwood
Joe C
Zwoa Meda Beda
Toma Marini
Cole Philips
#d4a #brakebias
00:00 Weight transfer and friction
03:51 Proportioning valves
06:10 CX-30 vs MX-5 vs MR2
09:12 Manual vs Electronic bias

[@d4a]

kzbin.info/www/bejne/eaqrZquFmNiLrtU Please watch this before commenting how and where surface area matters

[@himanshusinghmar8075]

Mahindra xuv 500

[@Eduardo_Espinoza]

Is it true that wider ones can handle more pressure force? So more grip or more pressure for the same grip??

[@marcinj.5287]

There is one exception of this rule. Cadillac STS-V has bigger brake disks in the rear thanks those in the front. 🤷‍♂️

[@ralphwarom2514]

Surface area increases a lot more than just friction. Attracative forces. Stickiness and adhesion. etc etc. Anyway, drag cars have larger tyres and lower pressures to increase surface area and allow more power to enter the ground.I'm actually not sure why friction is taught the way it is. It is incorrect.

[@TC-V8]

​@Marcin J. A few cars have larger rear disc diameters than the front. BMW 330 for example. More than just the disc diameter determines the brake torque, and obviously hydraulic pressure is also less on the rear with smaller caliper pistons. But rear discs are always thinner as they have less heat to absorb.

[@timothyellis6188]

Such a great explanation. You make it so intuitive to understand but at the same time keep it technical enough to make sure no detail is missed. Great stuff mate!

[@gretchenmorfea5988]

Very well said!

[@ShainAndrews]

Read a book....

[@youssef1770]

​@@ShainAndrews youtube: am i a joke to you?

[@safouder]

Everytime I watch one of your videos I learn 2 things : - The Content in the video - I'm literally at the top of the iceberg and there's so much knowledge to be acquired.

[@camerone397]

great video. I engineered the braking system on an FSAE car a while back and this reflects what I learned through doing that. It's worth mentioning how different caliper and master cylinder piston sizes can also have an effect on braking forces. Pressure equals force divided by area, so changing the total area of the various pistons in a given hydraulic loop will change how much hydraulic pressure and force at the caliper will result from a given pedal input force. This is also impacted by pedal ratio, brake bias, rotor diameter, etc. So you can have a car with equal-sized front and rear rotors, but bigger calipers on the front, and the car will still have an overall front-biased braking system (see the Porsche 911 as an example of this)

[@dougiequick1]

Please send this simple information to Yamaha Motorcycle corporate offices ...they seem very slow on the uptake....someone there just year after year fails to "get it"

[@mateuszczapski3003]

Thank you for your passion in making these videos. You always deliver a great and simple explanation. Keep it up! ❤

[@siddharthiyer1120]

I already knew why the front were larger but still clicked because I knew you'd breakdown and deliver even more information for better understanding. Good thing I did! Everythingfrom brake bias on was new to me, never would have guessed that there were electronic brake bias-ers. Keep delivering these HQ vids man you have a great way of divulging lots of important info in digestable and understandable formats

[@bytesandbikes]

Thanks for another interesting video. 😊 F=µN doesn't apply to viscoelastic friction, and is generally a poor friction model. The EBD devices are great. A common failure is the linkage in the rear suspension - a good thing to check if your car is getting older.

[@mrblc882]

F=µN only apply to ideal body in school assignments.

[@dalebob9364]

Fun fact, the Volvo 240 had a abs proportioning valve on the rear axle of the Dana 35. It basically worked by detecting spikes in pressure and relieving it much like a wastegate on a turbo! The Volvo 240 is possibly the best all around vehicle ever made. I would regularly tow my four-wheel drive truck friends out of the mud and just because of limited slip and proper suspension geometry in the rear! It's funny how people think we are progressing when we haven't really made any advancements in internal combustion engines since the late '90s. If we were progressing even linearly, we should be driving 2 L 4 cylinders that make 200 horsepower and get 50 MPG without a turbo! I love the way you simply point out by walking around your apartment complex that electric vehicles are never going to be a thing. Their reliance on using third world country slaves to mine the Cobalt etc is another thing that absolutely discussed me about people driving around in their EVs, thinking they're saving the environment. Charging them on dirty coal power thanks to Brandon turning off all the nuclear plants. The fact that we aren't using nuclear is so blatantly obvious the way to destroy the globe is very disheartening. This concludes your story time with someone who actually remembers the good old days and unfortunately is very sad that that is no longer a farcical statement!

[@michak8029]

you forgot to add "*in ideal world" in part about friction, in reality everybody knows that wider tire = more friction and better grip, as we don't live in perfect world and equation you showed is true only till some point, where increasing mass doesn't increase friction in linear way anymore

[@mariemccann5895]

I start watching your videos and before I know it I am at the end. They never get boring and are informative throughout. Excellent work.

[@JoaoZagoSJC]

Amazing how you make these concepts very simple to understand. Even for a non native English speaker like me. Thank you!

[@johnnieguitar5724]

As usual, you covered everything important we need to understand about automobile brakes, and illustrated them perfectly. I am a visual learner, have always been, and understand concepts more completely with visual representations of the theory. Thank you! The Brake Biasing technology was something I had completely forgot about. Its no wonder you have over 800K subscribers!

[@Aeroman66]

This channel is incredible! Best explanation I have seen about brakes ever Thanks a lot for this, keep doing this fenomenal job

[@hea5843]

Sir, I have never known of any source which explains mechanics as efficiently as you do! Thank you!

[@Sarin-Q]

Very interesting to see. My 1991 Honda Beat has slightly more rear brake than front, which surprised me. Especially with both being single piston unventilated disc brakes.

[@rincam5]

sir thats my dream car

[@Alien26589]

No words to explain my excitement I wish i had this guy as my teacher in school I would have became an Auto engineer. What a wonderful opportunity KZbin is giving us to reach this kind of master teacher Thank You So Much Sir I'm grateful to KZbin algorithm

[@fengdeng1982]

Really nice video and explained everything clearly to everyone. Other channels regarding changing tyre width and changing caliper size looks stupid now after this.

[@windhelmguard5295]

one important hing about disc diameter: heat dissipation isn't really a big factor here, the brakes almost always heat up more quickly than they cool down and while a larger brake has more surface area to loose heat over, that difference isn't significant. what is significant is the larger mass of a larger brake disc. A larger mass of anything can absorb more energy before its absolute temperature increases to the critical limit of the material, and since we're not constantly braking, loosing heat slowly is ok, on the other hand, heating up quickly is very much an issue we worry about.

[@beneathpound9939]

Great video, great set-up. I'm really impressed with your development of the channel as the subscriber and regular viewer. Really great man.

[@ifixem9585]

In short, they need to be bigger in front to take more punishment, not because they "grab harder." Great content as usual!

[@TravisFabel]

It's not the first time he's not made that distinction. You remember he made a video earlier about how bigger breaks don't stop you faster, and then went on about how they're not needed. His perspective is that he is only talking about regular street cars, small European ones at that, so he tends to ignore performance aspects down to the point of saying things don't matter that do matter when you get to those levels.

[@potatopobobot4231]

​@@TravisFabel did u even watch that whole video ur referencing?

[@TravisFabel]

@@potatopobobot4231 probably... But to be honest I didn't even watch all of this one. Lol Like most things in life, things tend to be application specific when you want to get down to the details. In the applications I'm interested in are so different from what he's describing that sometimes it's not worth watching. For example, with the street tires he's talking about going to a wider tire he isn't changing the coefficient of friction. But I know if I'm going to a wider tire I'm also going to get a much stickier tire. So the coefficient of friction between the tire and the road would be dramatically different. So again I can just kind of ignore what he's saying there. Or in the case of my street car, I actually use a rear brake that is the same diameter (but not the same width) as my front brakes. But that's because that application is a large station wagon with electronically controlled dynamic brake bias that allows the car to use maximum rear braking before engaging the fronts more... So by decreasing the weight transfer to the front with my car being much lower than stock and my antidive being modified in my suspension, I can now use a lot more rear brake because there's more weight in the back of a wagon to begin with. So while weight is transferring forward and providing more pressure on the front wheels, all of this is moot. But of course that doesn't apply to any of the stuff he's showing here because it's very application specific. You would have to have a vehicle that has a large amount of weight on the rear, lower to the ground, with atypical suspension geometry and electronically controlled brake bias... That's very specific.

[@lowskillcamper]

They grab harder too. The braking force they are producing is much higher since most of the weight is there and friction force is larger.

[@stuckinmygarage6220]

​​@@TravisFabel Mr. Fable, We would like to see your explanations in your next video. I don't doubt anyone's expertise, but I'm personally (guilty through personal experience) turned off by hints of arrogance. Fortunately, for me, I learned that sitting in comfort taking on air of superiority is detrimental on the whole. We could all benefit if you could "start from the beginning".

[@podulox]

Philosophy... This is philosophy... Every child, past present & future, should see this video - Every year of their lives... The world is a better place because of this video.

[@shaulpreisman5601]

Really love all the recent video about brakes. Thank you and keep it up!

[@kaleemullah9522]

Amazing sir!! Its a great explanation to your last video about braking in which you claimed that surface area doesn't count and that got so much people confused.

[@williamoneil5696]

Please keep doing these excellent videos! I like to understand how things really work, and I love the detailed explanation you do about everything in your videos. Congratulations and keep up with your excellent work. Cheers! 😉🥂✨

[@c.a.r.s.carsandrelevantspecs]

This was the best video I've seen about Electronic Brakeforce Distribution! Thanks for teaching us so many fun and useful things! I've added this video to my favorites. 😎👍🚗🚙

[@sergiykud]

this channel answers questions i've always had. Thank you

[@atlegangletsoge6165]

I had to explain this to a friend sometime ago, but this video helped me understand the concept even further. Great videos as always

[@RobotDCLXVI]

I love your channel and the way you explain complex subjects in a simple way that anyone can understand. It is one of the hallmarks of truly mastering a subject. That said, I'm pretty sure the CX-30 comes standard with AWD.

[@freddoflintstono9321]

The tendency for a car to go straight when you brake is why about the most important thing an anti-skid school teaches you is letting go of the brakes when this happens (and yes, even ABS can't always help there). Without this, many instinctively 'freeze' on the brake when the car no longer reacts as expected, thus losing the chance to correct course. By changing that default reaction, you open more options for a potential better outcome in emergencies. I absolutely *love* how this is explained here.

[@tbas8741]

Honestly he just made this video to show off that awesome MR2 Project. I know they are hard to work on but i have always loved them

[@TheLoathsomeCowboy]

Excellent explanation - thank you. In the late sixties, I used to have the van version of the Morris Mini. It was pretty light in the rear end, and not even a pressure reduction valve for the rear brakes. Under heavy breaking (yeah, I was young and stupid) I put that thing sideways a fair number of times. On the plus side, it was great for handbrake turns.

[@dayeeter8962]

d4a always has the best explanations. a 6 y/o could understand this man's visualizations

[@Tyr1001]

great vid as always. I always enjoy watching your explanations even if its on something I'm already familiar with. At worst I become more confident in what I already knew, best case scenario I learn something I didn't realize I didn't! Hope you're getting some time in the dirt on the new Honda as well

[@unfinishedthought]

Great Video as usual! I'm always impressed how much I learn about a topic which I thought I knew completely😅 Little thing I find missing is that mechanical break force distribution was/is a thing since the 60's. Just some levers on the rear suspension opening and closing the valve to the rear breaks 👍🏻

[@toninocars]

Another great video. Thanks for doing such an interesting and educational clips. One thing to point though is that in many modern cars and particularly Toyota hybrids rear brake pads wear faster than front one as a result of ebd and the fact that in some stopping situations rear brakes are engaged while front ones are still off as the cars relays on regenerative braking plus the traction control constantly applies brake force in turns. 👍

[@arcrides6841]

Great explanation as always 👍

[@FriendlyPhoton]

So glad you put this together. Now everyone who's hankering for "big brake" upgrades needs to watch it. One niggling point, though. Adjustable brake proportioning valves do their thing by REDUCING brake force on a hydraulic circuit, typically the front. So adding rear brake bias means we're removing brake force from the front, not adding it to the rear. Overall brake force goes down, so more pedal pressure is required to accomplish the same total braking force as before. The only adjustable brake bias setups I'm aware of that actually ADD brake force to one end while reducing it at the other are dual-master setups with an adjustable balance bar that changes which master cylinder receives more of the applied pedal pressure

[@Resistolitin]

This is as good as it gets, amazing explanation.

[@vincifernandez1137]

Brilliant video, answered all my questions, more similar videos please!

[@tvh300]

So much more interesting than I was expecting! Thanks for sharing!

[@endurofan9854]

everytime d4agot a new video i got currious as to what would i learn next 😁 thanks d4a, you shared another load of knowledge 👌

[@_olamilekan]

You are very great in explaining car parts ❤

[@arlowelee]

Holy crap! I'm a BIG nerd about cars, but somehow I didn't know that EBD's even exist until today. You taught me something new today!

[@SupraSav]

Cheers. Something I thought was so simple and basic, yet I managed to learn more about it.

[@jahndolo]

hi mate, great channel! Really helped me understand complex topics quickly.... Please do a video on oil pressure(low oil pressure light) especially on boosted applications

[@WispyFrost371]

OH MY KANSEI DORIFTO!! Thank you so much!!! This topic has always eluded me, and I never really got why brake bias was that important, especially in endurance or GT racing. This video is beautiful!

[@d4a]

Thank you so much for your support. I sincerely appreciate it.

[@dianebranthwaite]

Nice to see you back 👍👍

[@halamish1]

Excellent presentation and explanation

[@brandongates1231]

I appreciate you refining your accent for us Americans some KZbinrs I can’t watch for such reason

[@OggyXXXL]

finally, a normal explanation for those amateurs who install discs larger than the factory size with the confidence that the car will stop better from the first braking thanks to them))

[@amoghkarigoudar2082]

stayed glued to the video the enitre time, great work!

[@Haganu]

Always a good day when D4A videos are in my recommendations

[@No_Way_NO_WAY]

Great Video! Explained in common terms without losing the science behind it. Regarding getting surprised by oversteer, i did experience this in a front wheel city car. Went into an exit of an interstate with about 100km/h bout an 180° turn with rather large radius. Was slowing down because of a car infront of me. (no real emergency breaking or stuff like that but from 100 - 70 over maybe 5 seconds) Suddently i realize i dont have to keep the steering wheel turned in like i did seconds before.... then i even had to counter steer... that is when i noticed the rear end of the car has gotten so light, i was actually drifting it *rolf. Drifiting in a 54PS FWD Fiat Punto. Since it happened so gradually, it was totally cool and controlled. When i went off the break, the car came back to neutral within an instant.

[@dnswhh7382]

Very good content and very well explained. Love it!

[@danyo1972]

Excellent video. Great information.

[@DannerPlace]

Great video, thanks for posting.

[@MonkeyDude1999]

According to Google: “Will wider wheels and tires affect your ability to brake and accelerate? That's an easy one to answer. Yes, those wider wheels will help you brake harder and take off faster. Wider wheels provide more traction and create higher acceleration.” Your explanation as to why wider tires won’t help is purely theoretical but in practice it does help a bit to have wider tires. 👍🏼 The rest of the video is great. Thanks for explaining. 😊

[@d4a]

kzbin.info/www/bejne/eaqrZquFmNiLrtU I never said wider tires don't do anything. I said that increasing the front surface area during braking isn't relevant.

[@negativeindustrial]

As a 1990 MKII MR2 Turbo owner I have to emphasize “Usually” larger. This is true of my 1994 Celica Turbo and my 1993 Soarer GT-T. However, the front and rear discs and pads are nearly identical in size on my early MR2. Later MKII Turbos got a big front brake upgrade with dual piston calipers from factory. Looking at your 1987, I can see that your brake system is very similar to the system on my 1990. Great video as usual!

[@TiborSzarvas]

I have a 1993 Citroen ZX Volcane, and the front and rear brake discs are identical in diameter too. Although the rear ones arent ventillated and the pads are smaller. Weird setup.

[@negativeindustrial]

@@TC-zf1ji Nice troll 👍

[@negativeindustrial]

@@TiborSzarvas Cool car. Bertone designed? We didn’t get them in my country. Is it fun to drive?

[@TiborSzarvas]

@@negativeindustrial yes it is bertone. it might look dull on the outside, but i am really fond of the interior (i have it with leather seats as well) and the single wiper on the front windshield just reminds me of DTM racing haha. It is very fun due to the manufacturer pushing and tilting the engine backwards to the firewall as much as they could so the balance is better. Also it has pasive rear wheel steering which is truly noticable under spirited driving. I once could keep up with a car with twice as much power on a short racetrack with lot of turns.

[@negativeindustrial]

@@TiborSzarvas That’s what’s up. Nice car, sir.

[@northborneo]

Very clear explanation, thank you.

[@hensh911]

Excellent video and explanation! The only thing to add is that the reason why understeer is more predictable is that most people, when going around a corner too fast and experiencing understeer, will apply the brakes. This gives the front tyres more grip, allowing the car to go in the direction they are pointing - ie. around the corner.

[@francoisloriot2674]

this only works if you brake hard enough to engage ABS. Otherwise a tire already at the limit (understeering) cannot provide any more force (braking). to regain traction you just lift the throttle, but of course most people won't have this instinct.

[@amateurtorque6709]

That's fascinating, I always learn something new from your videos, you must do a lot of research.

[@LJV-12345]

Perfect and simple explaination

[@ijonus]

So that's what those braking power regulators are... This channel is an excellent source of knowledge! But this made me thinking about my '91 Skoda Favorit I use for LONG distance tourism. I swapped the original unventilated 230mm front discs with ventilated 256mm Kia discs controlled by Mondeo brake calipers, and yes, it skids on the dry tarmac easily now, which is suboptimal :) But then they didn't even catch a sweat going down the Transalpina pass, which is a nice tradeoff. But I left both the regulators unchanged, and I didn't change the rear drum brakes. Car is most of the time loaded quite heavily at the back with the camping stuff etc., so basically I should A) get rid of the bigger brakes in front? B) replace the regulators somehow finding the fitting ones C) swap rear brakes for the discs at least (Polo 6n2 fit AFAIK) D) do both B and C?

[@rigobertomartell5029]

Great explanation. Thank you man!

[@kingGar27]

Great video as usual. Could you do a video on the best/easiest/most serviceable cars of the last 20 years (ish)? I’d love to know which manufacturers and models are designed with the humble mechanic in mind!

[@gottliebdee263]

One VERY important thing to note here is the chaps comment about ABS. Modern cars fool you into thinking you're a much better driver than you actually are. @10:30. I remember a 1 - Series I had on hire, and switching off the Traction Control made a bigger difference than I could have ever imagined. Completely exposed my lack of skill behind the wheel.

[@d4a]

I personally think it's not so much a lack of skill as the fact that most new cars are developed and set up around traction control being enabled. If you take an older fully analog car you might discover that you're skills aren't poor at all.

[@gaborb]

@@d4a i disagree with this one or at least in this form maybe if you unfold it more. However i know a car which can not brake in a straight line straight without abs but this is more the exception than the rule. Also there is an aspect that more powerful cars especially with electric engines (including hybrids) "needs" traction control. It is hard even for experienced drivers to handle the instantaneous torque and if you release the pedal you (can) have the same amount in the "opposite direction". In the recent (G2x) BMW cars in sport mode you can "drift" (at least in snow) with full throttle change direction only with steering. So i completely agree that "Modern cars fool you into thinking you're a much better driver than you actually are"

[@gottliebdee263]

@@d4a Maybe in my case a lack of practice certainly. I don't make a habit of putting my car in positions where I think I am going to bend it so never get the chance to practice what might be needed if the proverbial ever does meet the fan. Or.............maybe I have but the car has fooled me into thinking my application of throttle brakes and steering were reasonable ones?

[@paride_975]

Could you make a video about 'drifting'? What happens during a drift maneuver, how camber, toe, caster angles, sway bars, suspension stiffnesses and tires act during a corner in countersteer, and how they are usually set in a drift car....also the differences between a drift and a conventional (or racing) suspension settings. I know it's not an easy and simple topic, but I think you're the best person on KZbin that could explain these things in a precise and clear way. Thank you

[@musselicious]

Thanks for all your explanation videos so that we can understand this 🙂👍🏻

[@GuardianApe]

Still the best ... Keep it up man

[@anoimo9013]

Nice explanation and easy to understand. On 6:55 think that stiffer suspension does not change weight transfer by a significant amount

[@oldgreybeard2507]

Thanks for that explanation

[@diegoeduardonunez7097]

Seriously: Do you teach at any school or university? If not, you should!!! You are very clear.

[@SlyNine]

He's got a little to learn before he could. He's not way off but he does have some mistakes in the video.

[@jozsefizsak]

Great stuff. Always a pleasure! 😊

[@nadavleor]

Thank you very much! I'm learning a lot from your videos.

[@mickykamyk]

Great job, as usual!

[@Wtrxprs007able]

On my car (Holden VE Commodore), the rears are larger diameter than fronts, but the front has more friction surface area than rear. I would say that is because of the handbrake drum design taking up more area, making the overall rotor diameter larger. I have since changed this with a police pack upgrade, using the Chevy Caprice PPV front brakes, changing the front rotors from 298mm to 345mm and from 2 piston to 1 piston per caliper. Definitely stops a lot better now. I know of one other car with this style setup (Toyota 200 series Lancruiser) I've also noticed, as a mechanic, a lot of cars, mainly cars fitted with EBD and from around 2005 onwards, they tend to wear out the rear brakes a lot quicker than fronts too.

[@Low760]

I have a VF v8 and went with the 345 rotors but Brembo calipers from the caddilac cts-v iirc. Only because I couldn't get the steel calipers in Australia and the brembos were the same price. It kinda sucks you can only buy DBA rotors for it. Tiny vs the VF gts-r at 410mm rotors though!

[@Ndlelex]

Concisely explained!

[@mariokasapi8961]

Amazing job, again!

[@bv2289]

Awesome video mate! 👍

[@gottliebdee263]

This friction thing. I know a few of those formulas and remember some from things physics in school. Now some context from "MY" POV. Surface area does matter in the real world and here is why. Consider the illustration at 02:45. Imagine they are little hooks grabbing valleys and troughs in the road surface. The amount of force is spread across each little hook and it's easy to imagine one single hook being overwhelmed by force and heat and breaking itself and therefore breaking traction. More surface area means more hooks and less load per hook. That's what happens with a tyre - bits of it break off, hence they wear out. Discuss. Very useful series of videos though. All of them. Strangely enough, more context. 08:45. The subject of bigger brakes is applies here too, (I remember this guys video about it) and he says here that bigger brake capacity can absorb more heat. In a one off you'll not notice any difference but as bigger brakes can dissipate more energy, in the real world with repeated stops they can fade less quickly and hence stop you more quickly. Great to learn about the theory behind all of this though.

[@kurtbennett1164]

Amazing my friend. Wonderful information. As an automotive service advisor of 24 years, you even taught me something to help me guide my customers during sales. Awesome! Now, if by commenting I don't get those phishing 'you just won' youtube alerts I usually get when commenting on your vids my visit will be complete! LOL😂

[@d4a]

So far so good on the phishers 🥸

[@carlosrojosalguero1018]

Great explainer!!! Thanks! 🎉🎉😊

[@p6102zrfxe]

Excellent video. Thank you.

[@szymoniak75]

Could you make a video on how bike clutch and transmission works and how it differs from car's equivalent

[@igorbankovic78]

Simply explained 😊

[@dalebob9364]

It's really sad you have to explain this to people but I appreciate that you do! This is stuff I learned from Gran Turismo one on PS1 before I ever got a driver's license! That game tell us more about how traction and breaking and your contact patch works than drivers ed. If you don't go to a racing school now, you don't even know how your vehicle functions. We are truly evolving backwards as a species in every measurable metric!

[@ahnafzahid9450]

Much needed for motorsport education❤❤

[@stillcantfindmyperc]

Always really helpfull and interesting ❤

[@Chalkida24]

Very analytical video!!!

[@ericksonrodriguez6930]

I learned a lot on this. Thank you.

[@LJV-12345]

Perfect and simple explenation

[@jesseb3758]

Thank you, keep them coming

[@enge1369]

Well explained idol. The motorcycle does have a small rear and big front disc too but some motorcycles have both the same size of disc.

[@bobross6802]

Excellent !! Thank you !

[@Kytes93]

Btw nice explanation with Mazda i have a cx-3 and last year i changed front brake pads, i wanted to change rear omes this year but my mechanic said they are almost brand new. So the 80%/20% braking force is so true

[@kristianhermann5971]

Loved the video - thanks!

[@motocondria]

Bela explicação.

[@YounesLayachi]

Clear, thorough, without skipping a beat ! Great stuff as always :D

[@NLBassist]

Wow, great video again. I thought I knew it all, but I didn't.

[@devarsh2332]

Great explanation.seeing Indian xuv500