Brake Pedal Sinking? How To Diagnose And Fix It. Master Brake Cylinder

Is your brake pedal sinking all the way to the floor when you press it? Does it feel softer than normal, or spongy? Stop driving your car and watch this video your life could depend on it!!
In this video Josh shows how to differentiate between a "spongy" brake pedal and one that sinks to the floor and how to properly diagnose and fix it it. Lots a good info in this video that could save you from a potentially dangerous brake failure.
As always, make sure to watch to the end of the video so you don't miss any important information in order to do the job correctly.
Thanks for watching and if you haven't already, please like this video, subscribe to our channel and hit that notification bell so you get alerted when we put out new useful content! It really helps us to continue making great videos for you all.
Mahalo!

[@davidav8orpflanz561]

"I cut out a big hole in the floorboard in front of the driver's seat, which I can extend my feet through, and use my foot soles as friction pads on the ground to stop! If I'm going to haul a trailer, I have a passenger do the same with me, on that side." Modern Mechanic interview, 28,004 BC: FRED FLINTSTONE.😅

[@JMM599]

I found that strapping the brake pads directly to my feet vs using foot soles really saves a lot of money.

[@mygarden365]

Your explanation of the problem is very exact. Great content.

[@rvvanlife]

This brake fix video is detailed and thorough, thank you, good job.

[@user-zw9vv3dm7k]

Yes, I need a video on the master cylinder installation, please! Ty!

[@MisnadHaque]

Thank you and I’ll certainly point my mechanic to this. My civic has been suffering from sinking brakes exactly the way you mentioned for a while and the dealer had been skating over the problem citing worn brake discs. Resurfacing didn’t help and it still sinks. Explains why the Brake Hold system struggles too. Great explanation!

[@alexandertabagari8564]

Nice and simple explanation. Thanks

[@robertdeanda1961]

Thanks for the explanation of sinking brake peddle., I have to really check this out today I think like you mentioned I'm on the secondery safety one 🤯😳

[@kayodeOfaajifajobi]

I like your presentation. Good information. Well done.

[@BudgetMechanicHawaii]

Thanks!

[@user-zw9vv3dm7k]

Perfect! Extremely helpful! Thank you!

[@BudgetMechanicHawaii]

You're welcome!

[@raymondphan3806]

Thank you so much .. . .. You 're the best.

[@mortonarkoi9365]

I love your presentations it's perfect.

[@BudgetMechanicHawaii]

Glad you like them!

[@aiucci]

Well done!

[@95almendarez]

Best explanation ever thank you sir

[@BudgetMechanicHawaii]

Most welcome!

[@olguiq1013]

Thank you for this video...

[@BudgetMechanicHawaii]

My pleasure

[@petepam3621]

Brilliant! Stumbled across your channel and love these vids! Haven’t heard Bobs your uncle for quite awhile!

[@BudgetMechanicHawaii]

Thanks for watching 🤙🏽

[@inoketanidrala9294]

Very informative

[@BudgetMechanicHawaii]

Glad it was helpful!

[@legioner9]

Great explanations, as always. Quick and straight to the point. I would like to see how a brake master cylinder is replaced. My BMW has some weird braking behaviour, i.e. when I go like over 50 mph and brake really hard, the pedal sinks quite a bit, the ABS kicks in, but the car doesn't stop all that well, it travels more then I would like before it stops. Maybe it's just me having too high expectations.

[@BudgetMechanicHawaii]

Yeah it’s hard to say, abs is supposed to “reduce” braking in order to prohibit wheel lockup. So it’s a combination of tire quality, road surface, etc. That being said, it should stop sooner than you think since it’s literally supposed to maximize braking power…

[@user-zk3xm4ko1n]

On point

[@GeorgeMcCallister]

yes, please have a video on installing a master cylinder,

[@prince_of117]

Love your videos man. Solid info. Are you on any other social platforms?

[@BudgetMechanicHawaii]

Yes Instagram but haven’t done much there yet!

[@phillipherman4443]

I want to see a video on a master brake cylinder

[@BudgetMechanicHawaii]

It's your lucky day! This video covers the master brake cylinder.:)

[@luperodriguez5406]

Yes tenks

[@bonkeydollocks1879]

Youre looking at it

[@lockhamj]

😂

[@emmvee1678]

Installation video is what they were talking about

[@williamorights4374]

Thank you! I've bled my brakes 3 times in as many days - no leaks, and still the pedal will almost sink to the floor. getting a new master cylinder.

[@lockhamj]

Silly question, but do all cars have a brake booster, can't find it in my gs450

[@DanyoPJr42o]

What would cause my brake pedal to be stuck to the floor when pressed but will slowly come back up? Master cylider or Brake Booster? I havd changed Front Calipers, brake pads, rear wheel cyliders and brake shoes. Also bleed system after all work was done

[@ironearl69]

Good video. Quick question ...I have good solid pedal with my vehicle not running. Once I fire it up and the brake booster is engaged the pedal falls nearly to the floor. I can slightly build some pressure back by pumping pedal rapidly, but not where it should be or the firmness that was there with engine off. I'm not seeing any leaks from the MC to the booster, but like you said it could be bleeding into the booster and has ruined the diaphram. Your thoughts?

[@DanielR44]

Did you ever get an answer to this? I'm a new driver and i've got a 2007 Renault Clio which has the same issue! I can pump the brakes when the engine is off and it becomes firm however as soon as I turn the engine on the pedal goes soft again and I need to press down quite far before the car starts to stop.

[@cagr0311]

Have a car with very touchy/sensitive brakes. Suggestions? I barely touch the pedal and it breaks hard. ??

[@ScarabChris]

How about a brake pedal that doesn't come all the way back up but otherwise is fine. I had to really slam on the brakes last week. Now when I step on the brakes it feels fine and the truck slows normal. But when I release my foot from the pedal the truck will still be slowing down. But if I give the brake pedal a quick and firm stomp the pedal will return to the all the way up position and brakes are free. I have no problem stopping. I have a problem going after slowing for a turn or speed bump. Then of course when you try to go with the brakes engaged I get all the ABS and traction control lights.

[@user-uj6ye4qu3w]

Need a video on installation master cylinder

[@rabudman]

My pedal starts strong but slowly sinks as I sit. Been like this for months. Fluid level is below MAX but above halfway. I'd like to see a video on replacing a master cylinder on a 2016 Corolla. Front pads replaced 4 months ago. I replaced the rear shoes 4 days ago.

[@dailotom]

My friend's Corolla and my Civic had the same issue. Most likely the master cylinder or air in the lines if there are no visible leaks. Try bleeding your brakes if you haven't done so, could be air in the system. If that doesn't work, master cylinder probably needs to be replaced. Both of these are not very hard nor are they expensive repairs.. You should do it sooner then later. My friend left it like that for 3+ months and he almost got into an accident due to lost of brake pressure.

[@bonkeydollocks1879]

Its something you have caused when you messed with your front and back brakes, was it ok before you touched it

[@BudgetMechanicHawaii]

Is it very slowly? This could be due to abs module, but if it sinks in less than 5 seconds that not normal. I would suspect master cylinder. Air in brake lines will make it feel soft and spongy but not sink to the floor

[@rabudman]

@@BudgetMechanicHawaii Thanks. Now I'm thinking it's just air in the lines. It sinks slowly but not all the way to the floor and sometimes it feels fine. I'll try to bleed them soon.

[@musicmayhem7176]

Is this still the likely cause of this issue in a car with electric brake assist?

[@Trent52]

I replaced the caliper on my truck. I bleed that line till no bubbles but now the pedal go to the floor. You can pump it fast and it will build up pressure but it eventually goes to the floor again. Does this sound like air or mc?

[@BudgetMechanicHawaii]

Sounds like a leak or yes MC

[@ingridnicole1120]

Hello! I hope you are well. My dad has a 2001 ford f150 and we have a sinking brake pedal problem. We have changed and bled the master cylinder, we also changed the brake booster, as well as the ABS module but the brake pedal is still sinking to the floor. We even changed all four brake calipers. We have bled out the brakes numerous times and gone through many bottles of brake fluid, but the problem remains the same. Are there any other potential causes as to why our brake pedal is still sinking? Please let us know. Thank you in advance! :)

[@ingridnicole1120]

In addition to this, when the car is off and we are pressing the brake, the brake pedal is firm. But once we turn on the car, the brake pedal sinks all the way to the floor.

[@sentire1152]

What do u think it is when ur pedal goes to the floor and the brake master cylinder is replaced and brakes bled out of air? I have done all the work and still have a soft pedal and bled it multiple times

[@idraweveryday5]

There's a big chance it's the vacuum booster.

[@andrewallen8764]

Master cylinder install please

[@ChristopherPapp-ig1kx]

I've replaced my master cylinder, checked for leaks and cannot find why my pedal sinks to the floor. Having no abs warning lights appear. It's so frustrating. Need help!

[@Eagle17762A]

Have you checked your abs?

[@augustinekrau9064]

Hyundai H100 i replaced the Master brake cylinder but still no pressure on the pedal. No leaks also. Tried bleeding, it holds for a bit but sinks again

[@BudgetMechanicHawaii]

Tried bleeding? Did it work? No bubbles? Did you bench bleed the master before putting it on?

[@viddyasaagar5457]

hyundai cars (in india)are notorious for this brake sinking problem...and no repair can set it right...this is experience of many many hyundai car users....a blunder manufacturing defect.....nothing can be and ever done by any mechanic here..in india....any sugfestions???😢❤😢❤

[@zeeshanahmed720zeesh]

How to fix the internal leak on the master cylinder?

[@BudgetMechanicHawaii]

You can rebuild but easier to get a new master

[@tammy6493]

How to replace master cylinder on 2005 Ford Focus

[@BudgetMechanicHawaii]

We don’t have a video on that, but it will be basically the same process on most cars and there’s lots of great info out there

[@shangaubone5167]

I want to see a vedio

[@BudgetMechanicHawaii]

Same

[@krisn3230]

how to replace master cylinder

[@sandiemom8888]

This is exactly what is wrong with my 2019 dodge van. I can't drive it to a garage. I can't afford to tow it to the garage but I desperately need my car. What a girl to do?

[@davidav8orpflanz561]

Never, ever again, buy a Chryster product!😮