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Brake pedal going down the floor when braking
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Aldy
Novice
Jun 28, 2009, 7:04 AM
Post #1 of 9
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Brake pedal going down the floor when braking
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Hi! this is also about my 1991 Honda Civic sedan 1.5L. The brake pedal goes down the floor when braking but this is not consistent. Sometimes the braking is okay and sometimes not. There is no leak anywhere in all 4 wheels & I checked the disc brakes and the rear drum brakes are still okay. The brake fluid level in the reservoir is full. I suspect that the the brake master assist is failing. How will I fix this. I'm a DIY guy. Please help. . . . . .
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Sidom
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Jun 28, 2009, 7:14 AM
Post #2 of 9
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Re: Brake pedal going down the floor when braking
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Those are classic symptoms of a master cylinder bypassing. The internal seals can't hold the pressure & since it's internal there is no fluid loss.
A power booster won't cause the pedal to go to the floor.. When they fail you lose you assist & the pedal is hard....
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Aldy
Novice
Jun 28, 2009, 7:22 AM
Post #3 of 9
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Re: Brake pedal going down the floor when braking
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Hi Sidom, thanks again for your reply, so does this mean that I can just replace the master cylinder gaskets and my problem is solved or will it be easier to just change the whole master cylinder?
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Sidom
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Jun 28, 2009, 7:59 AM
Post #4 of 9
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Re: Brake pedal going down the floor when braking
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It would be better to change the whole master cylinder
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Hammer Time
Ultimate Carjunky
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Jun 28, 2009, 9:46 AM
Post #5 of 9
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Re: Brake pedal going down the floor when braking
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Although Sidom is right that the master cylinder is usually the cause, I have had 2 vehicles in the past month with the same symptoms that BOTH of them turned out to be debri stuck in one of the valves of the ABS unit. The way i cured it was to slam on the brakes on a gravel road so the ABS activates and clears the debri. I had already changed the master on both of these cars and still had the same problem until flushing the ABS valves this way. Pressure bleeding did nothing for the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
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Jun 28, 2009, 10:01 AM
Post #6 of 9
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Re: Brake pedal going down the floor when braking
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That's interesting Hammer.... I haven't run into that yet but I see where it can happen
Just a couple of quick questions on those....
Was the ABS light on? and Was it the same symptons as a bypassing master (sometimes a pedal, sometimes not) or was this like a total failure & just couldn't get the pedal back??
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Hammer Time
Ultimate Carjunky
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Jun 28, 2009, 10:06 AM
Post #7 of 9
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Re: Brake pedal going down the floor when braking
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No ABS light. No brake light as long as the reservoir was full, although you could put the light on if you let the pedal drop enough.
It was EXACTLY the same as a bypassing master. One of the solenoids just wasn't closing all the way. As soon as I activated the ABS a couple times, the pedal got solid and no further problems. I had already replaced the master and flushed the system on both of them. No further bleeding was needed for either one also.
One was a GM and one was a Ford.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jun 28, 2009, 10:08 AM)
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Aldy
Novice
Jun 29, 2009, 12:55 AM
Post #8 of 9
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Re: Brake pedal going down the floor when braking
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Hi Hammer,Thanks for your reply, my car doesn't have ABS so I think Sidom is right.
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Hammer Time
Ultimate Carjunky
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Jun 29, 2009, 1:23 AM
Post #9 of 9
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Re: Brake pedal going down the floor when braking
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I would say he's right also.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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