5 Causes When Brake Pedal Sinks to the Floor

Рет қаралды 137,886

Жыл бұрын

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.
www.backyardmechanic.org
By using this information user assumes all risk of use.

Пікірлер: 99

@genagx Жыл бұрын

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

@saltycreole2673 Жыл бұрын

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

@judymagdaleno5323 Жыл бұрын

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

@Spidabeast45 8 ай бұрын

Thanks for this i really needed this. Brakes been acting up

@ETAYLOREMT 4 ай бұрын

Great breakdown ❤

@thomvogan3397 10 ай бұрын

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

@mrslimz4148 3 ай бұрын

By far the best video cheers

@justin806806 4 сағат бұрын

Thanks sir

@Adr_Jim Ай бұрын

Also an internally leaking ABS module can make the pedal sink to the floor just like a failed master cylinder would but a little slower.

@Lostboy563 5 ай бұрын

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

@ange.luvs. Ай бұрын

Same.. was the master cylinder the fix?

@djamiljo93 24 күн бұрын

Hi, I watched many videos already since I found your channel yesterday. This channel is why I love youtube and the internet. Great information well presented straight to the point. But I have to say the channel really needs playlists. It would make finding the content much easier. A general playlist for videos like what is X part or what does X part does. And playlists by car model or brand. You know the videos you released better than I do so you should have a better idea of how to organise them into playlists. You still earned yourself a subscriber! Keep up the good work very informative channel. I just got my first car so I want to learn everything about cars right now. I would love an introduction to cars systems series of videos going through the names of each component and function, might not be what other subs want but i'm going to throw it out there.

@HVAC_Mechanic 24 күн бұрын

Thanks for the input. I will have to look into the playlist option.

@lutherredman8664 6 ай бұрын

Hello my car pedal is low when cold and first starting then about 10 to 15 minutes of driving it goes back to normal do you know what can cause this

@yamier8078 11 ай бұрын

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.

@marek196c 5 ай бұрын

did you got figured the problem out?

@jmayor_ 5 ай бұрын

Solved?? I'm experiencing the air sound on my 2019 Civic

@marek196c 5 ай бұрын

@@jmayor_ not yet, waiting for new (used) abs valve block, you can check it by blocking your master cylinder, if then it stays hard, then you have abs problem. From what it seems abs blocks from Ate have problems with it.

@DanyoPJr42o 2 ай бұрын

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

@Pdrydenhol 9 күн бұрын

So my break petal get hard sometimes after driving for awhile?

@topk1790 Ай бұрын

Hoping its just this break fluid 👍🏾

@miltonguzman9955 2 ай бұрын

So I have no leaks but my breaks work but sometimes it dosent wanna hold like if my idle was messing with it

@jamesjacobs8785 2 ай бұрын

Could also be a bad wheel cylinder

@user-jv6ts9dr1b 6 ай бұрын

Hi, I really like you explanation simple but good 👌 2014 Nissan Titan SV and I check my same way you explained and yes my brake paddle go ale way to the floor, I check hose vacuum and work fine , the brake fluid is no to bad, so you think in my buster? 😮 Ricardo from state of Utah

@user-jv6ts9dr1b 6 ай бұрын

I forgot, I bleed all my for calipers and is no air, can you give me you opinion

@guyerikk 6 ай бұрын

#6 Wheel Cylinder if it applies your brakes

@jamesward5721 7 ай бұрын

It's usually a rear cylinder. Now & then it's a leaky pipe or a sticking front caliper - but generally it's a leaking rear cylinder. I lose track of how many "The car has no brake pedal" jobs we have done where it was just a leaking rear cylinder but nowhere diagnosed that - despite the owner taking it everywhere before coming here. Check the damn cylinders. How hard is it?

@ErnestoDiaz-uy1hz 3 ай бұрын

Or the brake calipers

@alanmurray3624 8 ай бұрын

Don't fill master cylinder until you check pad wear if pads are all 50% or better look for leaks at caliper

@Topnotch692 8 ай бұрын

Mine goes to the floor when i try to press it gently, but when i do it ina more fast movement it actually has some pressure

@mr.dee1329 6 ай бұрын

Did you ever find out exactly what the problem was ….mine is doing the same thing.

@Topnotch692 6 ай бұрын

@@mr.dee1329 im actually going to my mechanic tomorrow asking about that. Its scary when u going in the highway and you lose pressure, it may be something in the pedal itself but worse case scenario its something wrong with the brake bomb

@DTSupstateNY 6 ай бұрын

You don’t owe someone money do you? Lmao

@Topnotch692 6 ай бұрын

@@DTSupstateNY me? To who?

@Troops-pi8md 6 ай бұрын

You have air need to bleed it

@juansebastianambrosiorinco7708 6 ай бұрын

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

@SaltySnook 3 ай бұрын

May be the guide pins sticking

@nolix3420 6 ай бұрын

I have to hold mine to the floor if let go of it a little it starting making a grinding noise and sometimes the EPC lights when I break I have a vw gti 2.0t if anyone has an idea of what it can help thank you .

@carcasscruncher9354 5 ай бұрын

I was going 55 mph around a curve yesterday and lost brake pressure for a little bit. Pumped them until i got pressure again. Ended up being a 6th reason not mentioned. My left rear brake pad got so thin it slipped out of the caliper and got lodged into rotor and caliper frame. Caliper pistons became the pad. Got all messed up. So, theres a 6th reason.

@monetpierce7692 4 ай бұрын

I had something similar happen. Apparently my brake pad fell off completely. This caused a caliper to become damaged. Another caliper became damaged due to the uneven wear and pulling of the breaks.

@carcasscruncher9354 4 ай бұрын

@@monetpierce7692 yep, same. My pads never squeaked to warn me they needed changed. I think the squealer rusted off long before the pad was getting near the end of its life. Probably a good idea to inspect them once a week.

@rodeo69778 4 ай бұрын

I have no pedal. Brake line blew. Went to bleed and broke another. So being I didn't want to deal with more of the same I replaced 4 out of 5 lines connected to the distribution block. 04 Tahoe. Bled all brakes. Distribution block first then bleeders. Still no pedal.

@rodeo69778 4 ай бұрын

Also had to replace both rear calipers.

@kgosiemangwagamang7135 3 ай бұрын

My car it loose air on brakes ,u blow it after minute air is gone and brake fluid disappeared and colour is black

@John-E_Gaming 7 ай бұрын

I just did a diy break fluid change on my car and it's doing this right now how do I fix it I think their might be air on it but idk

@HVAC_Mechanic 7 ай бұрын

There is likely air in the lines and the brakes need to be bled.

@dnsnol1958 7 ай бұрын

I have back brakes but no front brakes when start the car pedal goes to floor when car is off it is right up there where it should be

@dougsanders6034 5 ай бұрын

I have a 2003 Ford Taurus that does the same thing. New master cylinder, Brake calipers, rear wheel cylinders, new rubber brake lines , three 2nd hand ABS modules. New brake booster. Fully bled the brakes several times. Still don't have any brakes. There is no warning light on the dash.

@user-ps7xc1rd2h 7 ай бұрын

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.

@HVAC_Mechanic 7 ай бұрын

Yes, for sure get it checked out.

@ThatBeardedGuy69 2 ай бұрын

Figure out the problem? I was on a hill as well.

@mattb6118 Жыл бұрын

No leaks, peddle is spongy and goes to floor have to pump brakes to get them to work. I have replaced rear drums and shoes and adjusted them properly (slightly dragging on drum) figured master cylinder bad and replaced. Bench bled master cylinder. Bled every wheel until all fresh fluid coming out with no air. Pedal still going to the floor and have to pump to get to work. Any thoughts????

@jonalvarez2730 11 ай бұрын

Propably a failed wheel cylinder if you have drums check for leaks at the cylinder have you tried abs bleeding procedure with scanner ?

@mattb6118 11 ай бұрын

As I stated, no leaks which include both wheel cylinders.

@mattb6118 11 ай бұрын

Ended up being a lose axle nut on the front drivers side , torqued it to spec (173 foot pounds) Brakes work great!

@OsamaBinLlama 8 ай бұрын

@@mattb6118 so the master cylinder wasnt the issue?

@Flynerdybarber Ай бұрын

Master cylinder g35 coupe

@brucetapscott5345 11 ай бұрын

Everything is new still brake peddle gose to the floor

@d.cent1326 10 ай бұрын

Why add the brake booster if the symptom is a hard brake and not a sinking one? How would a good brake booster operate with a sinking pedal??? Thanks

@sushisuzanne99 10 ай бұрын

My 2008 Ford Escape has been in two shops, spect a thousand dollars and had two master cylinder’s repairs without fixing my brake problem. The brake pedal looses pressure while driving and sinks almost to the floor. The place where I had it done said they want to be paid for labor and parts but the original issue has never been fixed. I’m at a loss. Could it be the brake booster? Please help.

@HVAC_Mechanic 10 ай бұрын

It's hard to say, but a bad booster or the vacuum going to the booster can be an issue. Here is a video on how to test the booster. kzbin.info/www/bejne/eavMYZ1uqLCsa80

@leelakrishna888 9 ай бұрын

@@HVAC_Mechanic all sudden my car brakes feels in effective.. when I hit breaks in traffic it will stop the speed and leaves all sudden...which makes me afraid to drive and today I hit a truck where my bumper is damaged . Kindly suggest me ...( My breake pedal is not so smooth or to the floor ..but yeah will need to push it hard to stop and few times it will leave the grip in middle and makes me hit the car which is before me with 5 to 10 miles speed..

@JayMorris-ib6vk Жыл бұрын

What causes my brake pedal to suck down to floor when i turn on ignition

@saltycreole2673 Жыл бұрын

Good question.

@shadowhawk3790 11 ай бұрын

Abs module

@philipjosephbeaulieu7792 2 ай бұрын

What is it when the pedal goes to the floor while driving but does not release when you take your foot off?

@philipjosephbeaulieu7792 2 ай бұрын

Fluid is at max line, but dark. I don't see or hear any vacuum leaks and no fluid leaks visible anywhere in the system. Brakes were fine, and the next day brake light on dash turned on when I got to my destination and could smell like brakes pads only in the front were cooking and smoking a little. With the keys in hand and no one in driver seat the brake lights were still on for about ten mins.

@HVAC_Mechanic 2 ай бұрын

It needs to be examined, but it sounds like the master cylinder is going bad, and the fluid needs to be replaced.

@meganchristmas8752 9 ай бұрын

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 😭😭😭😭

@ThatCptStarsoundGuy 3 ай бұрын

Hi, have you ever manage to sort this out, cos I have the EXACT same issue😭 I'm so frustrated I can scream. Please help 😢

@zackery0507 Ай бұрын

I have the same problem too 😭

@bmxrider8284 2 ай бұрын

Aye Foo why dose my peddle have have pressure when I pump the breaks but once I start it the peddle goes all the way down like I have no pressure wassup with that anyone that knows get at me

@brucetapscott5345 11 ай бұрын

If I pump it seven or eight times start the car the pedal will go down it goes down more than 1 in three or four in down

@niknovsak3288 9 ай бұрын

that's okay, varies from car to car. If brakes work as they should, its no problem

@jesusgjchuza6491 11 ай бұрын

I just replace the master cylinder & the vacuum power booster, & still my pedal go all the way to the floor, any suggestions? Thank you

@HVAC_Mechanic 11 ай бұрын

Was the brake booster bled first before installing, and all the wheels bled?

@armoricain 10 ай бұрын

@@HVAC_Mechanic did you mean "Was the master cylinder bled"?

@dougsanders6034 5 ай бұрын

Does your car have an ABS module?

@jesusgjchuza6491 5 ай бұрын

@@dougsanders6034 yes

@dougsanders6034 5 ай бұрын

I have the same problem and I have replaced everything . I did get 3 ABS modules from pull-A-parts salvage. Non of this has helped. I can bleed the brakes and have a good pedal untill I crank the car and then It goes all the way to the floor. It has no warning lights ln the dash. I also have an Autel scanner with a bidirectional function that I have used on many othet cars to automatically bleed the brakes and for some reason it doesn't work on this Ford Taurus. Electrical problem somewhere . Everything else has been pretty much prooved to be working. I wish That I could help you find your problem, but i'm almost certain that mine is in the ABS electrical circuit.

@lucrisdelarosa 10 ай бұрын

I changed a front brake caliper on my Accord 2014 and it sinks even after 2 bottle flushing. Before that was everything great. What can i do, pls?

@JereB698 10 ай бұрын

It sounds like the caliper needs Bled.

@dougsanders6034 4 ай бұрын

Make sure the parts store gave you the caliper for the correct side. You can check this by looking at where the bleeder screw is on the caliper. It should be close to the top. Many of these calipers will fit either side , but if its on the wrong side , you won't be able to bleed the air out of it. Good luck , l hope you find the trouble.