How Multi-link Suspension Works

Here's how a multi-link suspension works on a passenger vehicle.
The multi-link suspension is an advanced suspension design that consists of a series of links or suspension members that attach the wheel carrier to the vehicle body. The purpose of the suspension system is to 1) support the weight of the vehicle, 2) maintain good tire contact with the road and 3) provide good ride comfort and handling for the vehicle's occupants.
In this video, a typical four and five link independent suspension is demonstrated as a 2004 Infiniti G35 sedan is taken apart piece by piece as an example. Parts are removed from the vehicle and cut apart, including the vehicle sub-frame, control arms, wheel carriers, knuckles, brakes, bearings, springs, struts, stabilizer bars, end links and drive line to study the scientific role of each and every component in the multi-link suspension. A discussion of wheel alignment parameters, such as scrub radius, steering axis inclination, toe, camber and caster and its affects on vehicle dynamics follows.
The multi-link suspension differs from the McPherson and Double Wishbone suspension systems, which are covered in this video:
• How Automotive Suspens...
The double wishbone is a 3 link fixed variant of the multi-link design, while the McPherson utilizes the strut as 3 members in addition to supporting vehicle weight. Other suspension types include leaf spring, push rod, solid axle and torsion beam designs.
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www.etsy.com/ca/shop/Speedkar
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[@speedkar99]

Here's where you may purchase the tools used in this video: Colgate Toothbrush: amzn.to/2Jkxnvy (Canada) amzn.to/2RZlUUO (US) Impact wrench: amzn.to/2JwmGVc (Canada) amzn.to/2L8aIV7 (US) Control arms: amzn.to/2Jk1h2O (Canada) amzn.to/2XxbX6P (US) Stabilizer links: amzn.to/2xzHHZA (Canada) amzn.to/2JtdPDP (US) Impact socket set: amzn.to/2JuroD5 (Canada) amzn.to/2G1IE1x (US) Axle nut socket: amzn.to/2XyQGtG (Canada) amzn.to/2xCPIwU (US) Impact Universal Joint: amzn.to/2FWEgRh (Canada) amzn.to/2XxtUlY (US)

[@KendrasEdge757]

speedkar99 lmao@ Colgate toothbrush amazon links. Man if you had a sister I’d feel bad for her! Although it would make for a very interesting video!

[@joeyk920]

Colgate....😂😂😂😂😂

[@Miguel-ix2re]

speedkar99 where can i buy brothers underwear?

[@neonone9164]

@@Miguel-ix2re 😆 lol

[@___Q-bot]

4:30 It's an OralB

[@juancabrera-ru9jx]

"This bushing is stuck in it's sleeve..... Alright the rear sub frame bushing is on fire" that legitimately made me laugh. Keep up the great work

[@speedkar99]

I ain't got time with Rusty bolts...out comes the angle grinder!

[@wholeNwon]

Customer's car. Got a little carried away. He just came in for a tire rotation.

[@speedkar99]

You should say that about my last video...where the whole car was cut apart!

[@Tony32]

Good news is I replaced your entire suspension system, bad news is I had to cut the car in half.

[@speedkar99]

So sad but hey, it's for science!

[@jtapoling]

"And here's a pretty unclear shot of the rear suspension." All most fell off my chair laughing. You made my day with that one.

[@speedkar99]

Awesome

[@glasser2819]

I like all the trade-marked brother items... in contrast with the top notch engineering presentation 🤗 👍🏻

[@michaelbezos2969]

"Hot nuts". Buwahhha, funny "stuff" no matter who you are.

[@Mahigeer1]

Your knowledge of automotive parts and the terminology is impressive. An excellent retention of the names and concepts is also impressive. A part time teaching job in automotive industry is not a bad idea. Maybe not as much money as KZbin, but more satisfying. Thanks for taking the time to make these videos. I am retired ASE certified mechanic and enjoy seeing inside of the parts.

[@speedkar99]

That would be ideal. Any idea where to apply? Are there courses out there that teach how things work?

[@Mahigeer1]

Call your local trade centers, or community colleges where they teach automotive courses. Talk to the instructors. Perhaps you can join them as “guest”, so you would not need teaching credentials. Don’t expect much or even any financial gains, but the feeling is priceless. Best wishes.

[@nasedo3129]

I too am a retired ASE Certified Master Auto Technician. I agree, this guy should teach future auto techs. I sure wish I had videos like this when I was fixing cars. He should also teach other people how to make videos, his are fast paced and devoid of any wasted time. It's hard to watch other videos after watching these from speedkar99.

[@Mahigeer1]

I agree. He has the commend of concepts and terminology. His videos are more than putting grinder to the parts. I think he works/owns a junk yard, so he has access to various parts and has to know the proper names to get them for the customers. My instructors also emphasized usage of proper terminology. -Disassemble, not take apart. Camshaft, not “what you may call it”, or gizmo. I too made some teaching aids from various parts as part of school projects, but not everything. When working in dealerships, I was too busy to cut old parts and actually gave them back to the customers as proof of replacement. It is interesting to see the inside of the various parts.

[@voltigore]

"And here is pretty unclear shot of the rear suspension" Man, there is nothing like a cold beer after work and some nice speedkar99 humor. Cheers from Bulgaria, dude.

[@speedkar99]

Cheers! Well I thought it was a bit unclear because the lighting wasn't that good and the camera was full of slush

[@bentayahamza5459]

this is the ultimate encyclopedia of suspension thanks

[@speedkar99]

Cool, I'm an encyclopedia now 🤓

[@yasirshah8468]

This was really well put together. The terminology and nomenclature through the lenses of materials engineering and vehicle dynamics/kinematics was spot on, and you took the time to focus on all the key components and mapping them to actual measurable/tunable/sensible parameters. The sway bar demonstration alone is truly one of its kind on the internet. Learned a great deal!! Thank you!

[@alexrichmond46]

Also, I like the toothbrush trademark, adds that uniqueness to the whole video.

[@Tony32]

You can glue back together your brother's toothbrush, he'll never know.

[@speedkar99]

And then when it snaps as he's brushing his teeth.... Congrats for making it all the way to end of the video 😀

[@ytugtbk]

Wow, a mechanic with an engineer's encyclopedic knowledge of componentry. The complexity is mind-boggling.

[@dominicfong6341]

I am glad my car is blessed with a plain and simple twist beam rear suspension. Another great show from you dear speedkar99.

[@speedkar99]

Thanks. Becareful what you wish though, the handling of the multi-link cannot be matched by a twist beam.

[@jeremys.4423]

@@speedkar99 who needs good handling in an econo-box? I know what I got myself into 😂

[@tomkoolman]

The rear subframe bushing is on fire 🔥 lol

[@speedkar99]

Had to get it out somehow

[@rickt2419]

Fantastic educational video with a fun ending! Thank you for all the prep work to highlight all the components, taking apart and explain each piece, doing all the editing before releasing the video and one more thing that viewers never see is when all is said and done, you still have that big pile of stuff to cleanup and dispose. THANK YOU, sincerely!

[@speedkar99]

You are welcome, and you are right, no one else does this kind of complete teardown. Scrap metal disposal is not a problem in my area...we have Hawks that fight for it when I throw it on the curbside.

[@yilancio]

After 10:29, you're just showing off. Great video!

[@speedkar99]

Haha Teach the people !

[@donutrangerr]

Your understanding of the engineering principles and automotive knowledge is amazing. You make understanding cars fun!

[@katynewt]

Love the commentary mate! Also, glad that you clearly explained how the links and arms affect the steering angle (virtual pivot part). 👍

[@thomasjhawke]

5:09 is a stroke of comedic genius if you edited that in.

[@lud985]

I'm learning a lot from this thanks for your videos

[@NathonDalton]

I'm really impressed with your in-depth knowledge. Great video!

[@speedkar99]

I'm glad you enjoy it!

[@AlfonsoCandra]

Cant tell if trying to be funny or actually funny cause its very informational at the same time

[@beongjoonkang3639]

Excellent video! Very helpful and interesting.

[@jannaneabdessamad9468]

I love your videos, right to the point, excellent editing, ... thank you 👍

[@speedkar99]

You are welcome!

[@alexrichmond46]

You are brilliant Sir! So much amazing knowledge!

[@Burkhart412]

Bottom line, I love your videos!! You do an awesome job. Thank you!

[@Burkhart412]

SCIENCE!!!

[@speedkar99]

You are welcome!

[@michaelbezoski3096]

With your knowledge of suspension geometry you should explain the dreaded "death wobble" on Ford trucks. Thank you, great job of making my head spin. Your #1!

[@speedkar99]

Death wobble is The track bar bushings, right?

[@michaelbezos2969]

@@speedkar99 Seems to be a mystery to most, including Ford Techs and owners per most forums. I had a chevy 3/4 ton that would literally bounce like it was on a trampoline. Ended up being the brand new HD shocks. When I installed, I positioned in place, cut the tie wraps, shocks went up into position. I bolted in place. A week later pulled them off & my 10 year old daughter could compress them. A slight rolling road would get that truck bouncing like something out of jackass movie. New HD top of the line NAPA shocks. Must have been Friday, end of day, before a three day weekend manufactured set of four. Go figure, right.

[@johng5295]

Thanks in million. Great content.

[@koi0009]

You are a real master teacher ! Greetings from Italy

[@speedkar99]

Thanks! I'm glad you appreciate my skillset.

[@dmajumdar2059]

Great video as always. Love the physics explanations.

[@speedkar99]

I try to mix a bit of science with the practical

[@sachinrana1541]

you are great this is the first video i have found which gives such a brief explanation with actual footage and i was waiting to see that only. it took me much time to find you out on youtube but i will be going through all of your videos.. love you and your work broo..

[@speedkar99]

Glad you found my videos helpful thanks

[@thebrain7693]

Great video! and brother references are priceless :)

[@yossarianmcnulty7979]

Love from India. Have subscribed to your channel since a very long time and gained from your knowledge. Thank you very much.

[@speedkar99]

I'm happy that you are learning

[@1009477]

You make amazing educational videos!!!

[@hammerhead6537]

Another great video. Thank you.

[@speedkar99]

Awesome thanks

[@belize620]

Awesome video everything was very well explained. Thank you Sir. 🙏🏽

[@iCornerbacKi]

Thanks for the video!

[@JaZoN_XD]

"I just ended up chopping the subframe" WELP THAT ESCALATED QUICKLY

[@speedkar99]

Cutting aluminum with an angle grinder is not recommended

[@sinceapril88]

This is a fantastic video that is for this I did not know what was multi link suspension until I watched this it was very detailed

[@speedkar99]

Glad it clarified everything

[@nico.perrone]

Espectacular explicación! Saludos desde Agentina 🇦🇷

[@donatasdicmanas5009]

Just wow. Best car suspension video on youtube!

[@speedkar99]

Thanks

[@Zspeed]

Awesome video, great information, thank you so much for sharing!!!👍👏👍

[@speedkar99]

Glad you learned something

[@dc5723]

Awesome video, thank you very much. Applied physics at its best.

[@speedkar99]

You are welcome!

[@aaronbanda5201]

Great video man,always looking to your new videos

[@speedkar99]

Thanks! I just posted one today

[@AgsCgs]

Always liked your style... Welldone keep it up.

[@speedkar99]

Glad you appreciate my work

[@sashole1]

Phenomenal no-bull info delivery.

[@speedkar99]

That's my style! Thanks

[@sashole1]

@@speedkar99 So I've repeatedly noticed. Have learned a lot from your tear-down videos undiluted by any unnecessary verbal water. Please carry on in the same manner.

[@automobili2801]

Great video as always!!

[@speedkar99]

Thank you!

[@Yathuprem]

Liked and added to favorites video lists

[@speedkar99]

Awesome thank you

[@gacherumburu9958]

Nice explanation! Thanks! 👍

[@speedkar99]

You are welcome

[@edgardaspilcueta738]

Amazing video!!! keep up the good work!!!

[@speedkar99]

Thanks

[@Ita1ionstalli0n2]

Honestly, you deserve more views.

[@manthan1994]

I want to understand those concepts like u have did.. Guess i have to watch all of your videos

[@speedkar99]

Yep. I got a whole series of these videos. Thanks

[@m.r1164]

U are awesome.......am learning a lot from you.

[@fvasfy3149]

Dear sir, Thank you very much for your amazing video. It teaches me so many facts. I will apply what I am learning from your videos in wide range of productive projects. I promiss to my self to clearly mention you in them if I could achive any success . You hard work and talent are highly respected by me .

[@speedkar99]

I appreciate the feedback. Thanks

[@AlexxanderOnYoutube]

cool stance on that infinity in the intro

[@Enigmaafk]

Very informative keep the video coming:)👍alot of work involved

[@speedkar99]

Thank you very much. It sure is alot of work!

[@kamalashraf4846]

Great video man.

[@speedkar99]

Thanks 😉

[@MegaHugro]

Damn, I can only guess how many hours or days it takes to put this 15 min video together. Good job.

[@speedkar99]

It took alot of research and a few days of filming

[@ScubaCat3]

You should set up a PO box so we can send you stuff you definitely don't need.

[@speedkar99]

Good idea, what would you like to send?

[@ScubaCat3]

@@speedkar99 Old clothes, dental tools, etc. Maybe even an actual mechanical tool or part. It'll almost definitely not be useful for the channel or anything else, but you never know...

[@davidjaller6039]

Thank you man!

[@madunwerkstatt3093]

Well explained.

[@speedkar99]

Awesome thanks

[@MuhammadTayyab-iv4rd]

Awesome as always 👏🏽👏🏽.... I can’t imagine how would you work without your brothers stuff...😁

[@speedkar99]

You are welcome. Brother or wife...I always got a full supply of materials 😎

[@makantahi3731]

good tips

[@luisgonzalez2024.]

This guy a master!!.

[@speedkar99]

I sure am 🤓

[@kushantha7]

Nice video as always . Disassemble a cvt transmission in a future video. 👍

[@speedkar99]

I really would like a CVT, if you have any parts car or places I can get a scrap one let me know.

[@dq79ctm81]

Sorry made me laugh so hard with last comment thanks and love these videos. Thanks again

[@sunildeswal8338]

Best work

[@vasanthraj6895]

Thanks professor

[@speedkar99]

You are welcome my student 😁

[@manikdj123]

Awesome, thank you,

[@speedkar99]

You are welcome

[@femininenergy]

you need to get Bro a new tooth brush too....lol Great Video. You make that all look fun!

[@MementoVivere23]

This guy should have a million subscribers just for using a toothbrush.

[@ghassanalfarra8935]

Damn, those modern toothbrushes, they sure don't make them like they used to .. I mean, if you can't use one to wiggle a bushing, how can you expect it to hold up while brushing those rear molars?! . . Excellent video and superb presentation 👍

[@speedkar99]

Exactly! To be fair that toothbrush had quite the mileage on it by the end of the video

[@johnfearn4979]

Very informative video as always! Keep them coming

[@speedkar99]

Thanks very much. Video ideas are always welcome!

[@johnfearn4979]

Not sure if you have covered it but what about a video on the difference between diesel fuel systems and petrol/gasoline systems? Maybe show how each work and the differences.

[@user-kc9hv2rw6v]

Thank you very much for another highly educative and pretty fun video! I've wathced almost all of your videos on car structure and have learnt even more than during years at college :D Keep on doing this! Greetings from Russia!

[@speedkar99]

You are welcome from Canada! I'm glad you've learned alot from these videos as I have.

[@jamesnguyen4340]

New to this channel but let's take a moment of silence in memory for the brother's toothbrush

[@speedkar99]

Silence

[@ruinunes8251]

Nice to know that I'm not the only one making use of the old tooth brushes lol

[@speedkar99]

They come in quite useful!

[@thetechlibrarian]

I absolutely love the way double wishbone cars drive, you can still get a very good driving car with McPherson even some of the best use them. But it’s sad Honda doesn’t use them anymore in there basic cars.

[@speedkar99]

Agreed!

[@NotJustCreative]

Great video. Keep up the great work! Have you done a video for diesel fuel injection pump?

[@speedkar99]

Thanks. No I haven't. Would you like to send me on to make a video?

[@NotJustCreative]

@@speedkar99 Yeah that would be great. I have no idea what kind of animal it is what it eats and how it runs. I hope there are enough things in for a video so it is worth slaying the beast. I'm curious about it.

[@hostilityy]

5:20 perfect reason why I bash whiteboard with marker lessons on cars. this dude just showed how sway bars work in real time. lets see if a drawing with crayons garbage can explain that. this channel is GOLD!!!!

[@speedkar99]

Thanks, and you are right, sometimes it's hard to beat practical examples and demonstration when trying to learn something.

[@johnybrokeit]

That was perfectly done and a lot of fun to watch. Huge respect for your knowledge of these machines as well as your way of explaining it all! I came here cuz im interested in this new 4x4 in india by a company called mahindra and this vehicle is boasting a multi link rear suspension so.. Thank you very much for making this really good video. Cheers!

[@speedkar99]

I'm glad you appreciate it!

[@jaysona2507]

The humor made me laugh with tears...🤣🤣🤣

[@speedkar99]

Haha good one 😂

[@jaysona2507]

@@speedkar99 more power...😄

[@tonysorice5142]

i have a 2014 grand jeep has a Rear suspension Multi-link i hope its any good

[@kristianhermann5971]

Something to be said for the simplicity of a torsion beam rear susp over multilink in a road car. Even Mazda has gone back to with the new 3, which shows it doesn't have as many compromises as one may think.

[@speedkar99]

Well that's what the media and Mazda/VW PR want you to think with thier new torsion beam setups. The reality is it is a cost cutting move that has been masked by adjusting other suspension parameters to make it's effects less apparent. Not much people would care because it's an economy car.

[@kristianhermann5971]

@@speedkar99Your probably right. But vehicle cost and repair cost are important to consumers too. Let the consumers and auto journalists decide 😉 Multilinks have their place (luxury, sports, race cars), but every car doesn't need one. Thanks for the awesome vid 👍

[@ThatWasherNerd]

"Alright the rear subframe bushing is on fire"

[@jonienglish3231]

Try to EXPLAIN 2021 TAHOE Rear SUSPENSION !!!! Compared to OLD Style 2015 Good Video BTW

[@ralph9594]

How would I go about lowering a car with 5 link suspension I’m trying to lower my blazer

[@herdyantrikuncoro8703]

Glad that you now sponsored by oral be

[@speedkar99]

Haha to be honest, Oral B is my wife's toothbrush, Colgate is my brothers A mix of both here 😉

[@JoeUrbanYYC]

So is multi-link so much of an improvement over other setups that a 90's car with multi-link should out-handle a 2019 car with just Macpherson struts? Assuming any worn parts have been replaced? Love your vids!

[@krischilamootoo6562]

By far my 06 g35 handles and rides like a dream compare to a 2019 toyota Corolla and I'm saying this out of experience and nothing has been replaced on my g35

[@JoeUrbanYYC]

@@krischilamootoo6562 good to know. I would guess that would always be the case until new cars just way out do old car stiffness, but even that could probably be compensated with things like strut tower braces etc. Better suspension geometry is just better.

[@speedkar99]

Agreed. Multi-link of past years (even on family cars like a Honda Accord) far out handles the cheaper cost effective suspensions offered now. The reality is not many people are buying cars for driving dynamics now, the masses want a car to go from A to B and won't benefit from the advantages of a more complex suspension geometry.

[@dickn.ormous1064]

It depends,PSA can make some great cars using simple set-ups.New cars have better torsional rigidity which compensates to some degree;also improvements in bushing design make cars more comfortable.I drive a 2007 Ford Focus which has multi link suspension and it holds to the road exceptionally well and soaks-ups road imperfections with aplomb.I live in a Greek island with terrible meandering cliff roads-full of dangerous curves.In such conditions you see the shortcomings of carmakers like Toyota who can make some bullet-proof engines but in terms of chassis design it lags behind .

[@cesarjorgemurillobarientos1813]

good

[@speedkar99]

Thanks

[@danekeeper1]

I have said it before and I will say it again.....YOU ARE AWESOME! what a great video. The portion where you shot the front suspension in action was amazing. I can't hit the like button enough....Thanks. BTW ..Do you wash your brothers underwear after every car dismantling or do you just fold em' up and put them back in his drawer??

[@speedkar99]

Thanks for the awesome feedback! I'm glad you appreciate it! I'll just out those undies back and let him wash it for me, why not 😏

[@user-ry6tu6qs7r]

''And here you can see the oil tank which is leaking a bit, i used my brother's birth certificate to wipe the oil and secured it with my brother's wedding ring''

[@speedkar99]

Haha

[@landshass2849]

I bought a 2007 Honda Accord LX (4Cyl) sedan with 100 K miles clean car fax one owner. I noticed the suspension was so rigid, I replaced the strut assemblies (all 4) with KYB but nothing improved. Now I have sand bags in the trunk to help absorb the bumps. Any idea how to solve the situation?

[@speedkar99]

What car are you coming from? Honda will be stiffer than a Toyota or Buick for example. You can also check your tire pressure and run smaller rim diameters with a larger tire sidewall.

[@landshass2849]

@@speedkar99 I came from the exact make and model which got totalled in a crash after 10 years of ownership. Rims are the smallest available (15") with Goodyear Cofortread tires and 2 points below the recommended air pressure, yet still rigid. It's worth to mention, the previous owner was an over weight since the driver seat is crushed and I have to restuff it.

[@grecogreco4]

Hey, do you think you can do a water pump to pump the engine cooling water ? Especially electric water pump you find on electric cars ? I'd love to see that !

[@speedkar99]

Check out my cooling system video: kzbin.info/www/bejne/a4e4YWWrjtNsbZI

[@Ankit__Mishra]

"clean it with my brothers underwear" coooooooool

[@protoslashwyl]

cool

[@nicholaspng130]

That’s a University knowledge of multi-link suspension. I’m convinced multi-link suspension is good. Lol

[@kamalabbady6778]

Where did you get all these cars for demonstration like that

[@speedkar99]

It's just one scrap car...many parts 😏 I bought it to tear apart

[@aleksandrnestrato]

11:29 There’s one more benefit here. If pause the vid at aforementioned point, you can look at that right front suspension and imagine how the wheel turns to either side. Now follow: when turning right this right wheel moves a bit forward, when turning left it moves a bit back. In other words the wheelbase becomes shorter on the inner to the turn car’s side and longer on the outer to the turn car’s side. What’s the purpose of it?

[@veranet99]

Great video. Your brother sure goes thru a lot of tooth brushes.

[@speedkar99]

Haha he has to with me keep stealing a new one for every video

[@JoshuaJEnriquez]

Why was it on fire in the first place?

[@makantahi3731]

snowing in jul, where you have studio, on south pole

[@speedkar99]

Canada 😁

[@makantahi3731]

i was in canada , toronto, in 1987. to visit some relations, nice and wide country, everything is wide and big made, no hurry people