5 Causes When Brake Pedal Sinks to the Floor

Causes and fixes when a brake pedal sinks suddenly all the way to the floor.

Posible Causes
Low on Brake Fluid
Possible Brake Fluid Leak
Air in the Brake Lines
Failed Brake Booster
Failed master cylinder

How To Test the Brake Booster
1. Pump brake with engine off.
2. Hold the brake pedal and start the engine.
3. The brake pedal should move forward toward floor.

By using this information user assumes all risk of use.

[genagx]

Thanks for this simple straight to the point video and saying what to check first vs last. Very helpful 😊

[thomvogan]

There could also be air in an otherwise good master cylinder so might need to be bled as well, also if too much fluid leaked out there could be air in the ABS module which unfortunately requires a scan tool with ABS function to remove

[haqiqiazaditv]

After bleeding my padle work ok for a day but after that again sane problem.
Please guide me

[ShakaShinePressureWashing]

Custom brake job here. Mine goes all the way to the floor. When I first start the truck. But I pump it and it’s fine. Stopping power is ok but I’m scared. It’s a $200, 000 truck.

[My_selfreliance.freedom]

I have changed my master cylinder brake were good but now my pedal goes right to the floor but if I pump up 3-4 times the brake pedal while driving they work what can I do it's an old 86 e350 dually

[saltycreole]

Thank you for the info not designed to hear your own voice like so many other Youtubers. Great job! Subscribed!

[justinbuys]

Awesome straight to the point video for us DIY

[bifomo]

I wish every how-to video was like this one. Straightforward and right to the point. Thanks!

[Moghetto]

Mine breaks perfect but I don't feel the pedal it just sinks down

[TheresaMean]

Original complaint to take car into Kia was steering wheel seemed loose an not turning properly Gerald took to kis said they recslsberated the computer wtf would the computer have to do with steering wheel then all three out 2 day's later Idc wtf any one says that fucken retsrd Gerald pees did it

[judymagdaleno]

I enjoyed your video you made it very clear what to look for and exactly how to do it .. for anyone to understand ...thank you for sharing your knowledge

[TheresaMean]

How about someone did something started out fine when driving sn steering wheel an break an gas pedal went straight to the fucken ground

[TomPittendreigh]

Change the rear brake cylinder(s) to solve this problem.

[TheresaMean]

Shouldn't of needed that done when Gerald had just taken car into Kia on Friday he fucked with it an pretending to be trapped in the car

[meganchristmas]

Ok so… I have VW Jetta… replace both front calipers, as one was sticky… I have bled all the calipers all the way around, disc brakes, no leaks.. pedal feels great, start car goes to floor, only a little brake at very end of pedal! Using tip toe!!( I’m short! Lol) went and bought a computer to bled abs, did that all the way around the car like 7xs, same issue… went and rebled normally, no air, start car hit brake, down to floor, pump a few times, it stiffens some and sinks back to floor! I’m not understanding and I need my car!! I have done everything I can think of! Master cylinder, has no leaks, never ran dry… help 😭😭😭😭

[juansebastianambrosiorinco]

Mine is stuck, it goes a little bit further but it’s not coming back to the normal position, I check my brake fluid and it’s good, my vacuum lines looks good, I think it’s my brake booster I already buy one I’m gonna do it my self next week

[tomatomelvin]

Replaced brake booster a month back, worked fine ever since, back to braking to the floor… but no visible signs of fluid leakage? I did notice my brake fluid level went down below maximum, i topped it off, still didn’t work. Probably the master cylinder then?

[yamier]

Our mechanic was looking at our car and said the ABS module had a leak. The pedal is super soft, goes straight to the floor, and comes back up slow. It makes an airy kinda sound when you push it down, and when you get to the floor it just drives down the rest of the way with no resistance. It’s a 2010 RT charger. We bled the brakes swapped out 3 ABS modules and bled the brakes between each module, the problem still occurs. The mechanic told us there was a leak in the last module, and the second module was good but the screw on one of the lines was rethreaded, but the brake fluid wasn’t leaking in the second module. We did most of these on the list but we didn’t check the cylinder. We’ll try it next time.

[Ilovemrgx]

I had this happened to me today, it was downhill as well and the car ahead was turning right. I tried to brake and nothing occurred I slammed it, nothing, slammed again nothing so I had to hit my car left onto pavement which slowed my vehicle down. Brakes worked fine after, should I still get it checked.

[Lostboy]

Thank you for the video very helpful my break fluid is very dark so maybe it’s the last thing to check with is the master cylinder and the pedal goes to the floor slowly but when I press the breaks fast the get hard then like two seconds they go slowly to the floor I don’t see no leaks and fluid it to the max never had leaking problems thank you for the great step by step information