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break pedal goes all the way down?


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cooldude
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Aug 13, 2008, 2:30 AM

Post #1 of 16 (3199 views)
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break pedal goes all the way down? Sign In

hello

when i break sometimes the break pedal would go all the way to the floor but the breaks work but when its all the way down i can feel it not breaking anymore its like its slipping and not gripping..but when i pump the breaks i get pressure and can break..i check my ABS fluids and there ok and new..

what cause that to happen?

thanksSmile


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 13, 2008, 7:59 AM

Post #2 of 16 (3194 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Loss of pedal pressure while fluid level remains full with no leaks noted and can "pump up" and work is usually a failed master cylinder.

Bleeding out all brakes would remove doubts about air in the lines and if air has gotten in the bigger question is why. Has this been consuming brake fluid?

T
_________________________________________
Long retired now


dmac0923
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Aug 13, 2008, 1:29 PM

Post #3 of 16 (3186 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

like tom said

a dropping pedal is either 1 or a combination of 3 things
1) air in the lines usually introduced after brake service
2) fluid leak, should be easy to spot
3) master cylinder failure, almost impossible to see from outside. they leak internally
__________________________________________________

2002 Ford Ranger
2004 Toyota Corolla
2011 Mercedes C300
1969 Ford Mustang Mach 1
1968 Ford Mustang 302 Coupe


way2old
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Aug 13, 2008, 6:29 PM

Post #4 of 16 (3178 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Number 3 for the master cylinder.



Being way2old is why I need help from younger minds


cooldude
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Aug 13, 2008, 8:39 PM

Post #5 of 16 (3176 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

thanks for the info..

i dont have any leaks and my fluid level stays the same ..

i know were to bleed it out but i never done that.. it seems easy to do.

do i have to have the car running when i bleed the lines or has to be off?
i do have to push the breaks down or just let it drip out ?
how long would i have to bleed each sides out?

is this something i can do myself ? after all im a do it myself type of guy
thats if i have the right tools for the job but this seems like a easy fix if its just the air in the lines..

if it was a master cylinder how much would that cost to fix? estimate ..

thanks guysSmileWink


Tom Greenleaf
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Aug 14, 2008, 5:21 AM

Post #6 of 16 (3168 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

What type of car - year, make, model, miles, etc.?

Without having found brake fluid low (did some place fill it for you like at another service?) this is highly likely to be caused by a faulty master cylinder.

Replacement can be straight forward but also can expand into more brake work if lines don't cooperate, bleeders fail or break which can make this a tough DIY job. Better to be an apprentice to this a first time as there's a lot of room for things to go wrong and the tools required to get out of it.

Bleeding procedures will vary from car to car. Engine running is not required for bleeding brakes for the most part,

T
_________________________________________
Long retired now


dmac0923
Enthusiast

Aug 14, 2008, 11:35 AM

Post #7 of 16 (3160 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

start soaking all your bleeder screws and the fittings on the master cylinder with WD-40. Make sure you use a line wrench so you dont strip the fitting.

as for bleeding with the car running, it really depends on the size/strength of your partner pushing the pedal, the engine running will give you power brakes and get a further pedal travel when bleeding and speed up the process.

i find it easier to have the car running if your bleeding partner is your wife or son because they might not be strong enough to depress the pedal when the car is off
__________________________________________________

2002 Ford Ranger
2004 Toyota Corolla
2011 Mercedes C300
1969 Ford Mustang Mach 1
1968 Ford Mustang 302 Coupe


Double J
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Aug 14, 2008, 5:14 PM

Post #8 of 16 (3156 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Just to add...

Make sure you 'bench bleed' the master cylinder first before installing on the vehicle....


Jim


cooldude
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Aug 15, 2008, 10:26 PM

Post #9 of 16 (3151 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

i dont know were the master cylinder is at? what dose it look like?
is it close to were i put the fluids ?
so when i bleed the master cylinder i have to have the car running?
i have a 94 rs integra..

thanks..very muchWink


way2old
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Aug 15, 2008, 10:34 PM

Post #10 of 16 (3150 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Uhhh cool dude. You may want to find someone to help you on this. Brakes are not something you want to fool with if you have no clue as to how it works. So, please find someone to help you do this repair. I would hate to have you come back saying you wrecked the car because the brakes were not working,



Being way2old is why I need help from younger minds


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 16, 2008, 7:21 AM

Post #11 of 16 (3144 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Ditto with way2old on that cooldude! If you can't quickly know where the master cylinder is located then this job isn't for you just yet.

Not to squelch your ambition but brakes should not be taken lightly for the obvious reasons. Any complications will require tools and knowlegde of the brake system as a whole. Best to let this job go or get professional help to assist with a first time at this,

T
_________________________________________
Long retired now


(This post was edited by Tom Greenleaf on Aug 16, 2008, 7:24 AM)


cooldude
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Aug 16, 2008, 5:01 PM

Post #12 of 16 (3132 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

went to the shop and had it bleed out and works fine now..

i was not there when they bleed the lines i just wanted to know if my 94 acura integra has to be running when bleeding the lines just incase i have to do that to my car if i get like a line leak or something that requires me to bleed the lines..

thank youSmile


way2old
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Aug 16, 2008, 5:57 PM

Post #13 of 16 (3131 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Usually the engine is off while bleeding. You just have to have enough stregnth in your leg to pump and hold the pedal with no power assist. It is safer with the engine off also. You can bleed them with the engine running, just be careful.



Being way2old is why I need help from younger minds


cooldude
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Aug 16, 2008, 6:02 PM

Post #14 of 16 (3128 views)
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ok thanks you very much for your help/time and i hope to learn more as time goes on and help others out with there problems as much as you did for me..

thanks again..SmileWink this is a great site


way2old
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Aug 16, 2008, 6:04 PM

Post #15 of 16 (3127 views)
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Visit anytime. Always glad to see someone wanting to do their own repairs.



Being way2old is why I need help from younger minds


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 16, 2008, 7:42 PM

Post #16 of 16 (3119 views)
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Re: break pedal goes all the way down? [In reply to] Sign In

Good news for now. The best part of that is now you know the bleeders work! The problem may reoccur - don't be shocked if so. The old master cylinder may be happy with all new fluid and work properly indefinately - can't say for beans on that - just time will tell. If air did get in the lines it is a question as to how - forget that for the moment.

Know that there's lots to understand about brakes. One basic something can expand into more and it's hard to be prepared for every possible hurdle they can toss at you.

It may be worth your while to get a book to just understand the basic priciples of operation of brakes. When and if you do begin to take on repairs and service of them just be ready with a plan if you get stuck short of the tools needed or know how of how to get out of a jam,

T
_________________________________________
Long retired now




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