Suspension & Brakes Theory, alignment, spring rates....

Sinking brake pedal

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Old Jun 8, 2011 | 09:10 AM
  #1  
Penny4urthought's Avatar
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Icon3 Sinking brake pedal

I have a 96 accord that has had the ABS light on since before i bought it, approx. 4 yrs ago. Recently my brakes have begun sinking to the floor. Its really bad. I will have them completely pressed down and begin rolling. Take it in to have it looked at and get told its master cylinder. Now..2 days later..Im being told its not the master cylinder its the ABS modulator. That after all these yrs its just now a must ($1600) in order to have brakes. Can anybody help me out here? I think these mechanics are screwing me...
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Old Jun 8, 2011 | 11:04 AM
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Default Re: Sinking brake pedal

It's your master cylinder seals, they are allowing fluid past them which makes the pedal sink. You'll have to pump them again at a red light to prevent rolling.

Just swap out the MC (bench bleed the new one), then bleed your brakes.. No need to mess with ABS afaik.
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Old Jun 8, 2011 | 05:03 PM
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pwebb0207's Avatar
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Default Re: Sinking brake pedal

this is the truth!
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Old Jun 9, 2011 | 11:22 AM
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Default Re: Sinking brake pedal

i agree with trey
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Old Jun 17, 2011 | 02:51 AM
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Default Re: Sinking brake pedal

ok...so should i just try taking my car to another shop and ask them to check this specifically?
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Old Jun 17, 2011 | 04:35 PM
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known's Avatar
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Default Re: Sinking brake pedal

No, you should do exactly what Trey said.

Originally Posted by Trey
It's your master cylinder seals, they are allowing fluid past them which makes the pedal sink. You'll have to pump them again at a red light to prevent rolling.

Just swap out the MC (bench bleed the new one), then bleed your brakes.. No need to mess with ABS afaik.
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Old Jun 17, 2011 | 09:34 PM
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Default Re: Sinking brake pedal

the modulator cannot be completely dismissed.
ask the shop how they diagnosed this
try applying steady pressure with engine off. if it still sinks, it's your master.
you could also bring it to another shop for a second opinion
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Old Jun 22, 2011 | 06:12 AM
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Default Re: Sinking brake pedal

There is no pumping them at a red light. They sink to the floor and pumping them does nothing...the shop diagnosed and replaced the MC and said it didnt fix the problem and That in order to fix the brakes the $1600 part is needed along with the MC. He then offered to take the new MC back off since that wasnt the problem..so the old MC was put back on. Whats puzzling to me is I jump in the car a few days ago and brakes worked for 3/4 of my running around. Last night i thought i was gonna have to e-brake to stop. Does that mean anything to anyone?
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Old Jun 22, 2011 | 07:32 PM
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Default Re: Sinking brake pedal

i can get you an abs pump. used though. but at a significantly decreased price
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