Brake fade after initial stop
03-11-2014, 02:38 PM
#1
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Brake fade after initial stop
The brake is hard at first but as you are stopping it fades very far down and I let off and it goes back to the top and then fades again. The dealer thinks its the ABS pump for $3500.00 plus labor but he has some question in his voice. What does the list feel
TIA Jack
TIA Jack
03-11-2014, 02:53 PM
#2
Rennlist Member
Sounds like they simply need to be bled.... but unless something was done to introduce air in the lines, that would not be the case...
When did this start happening? anything done prior?
Anything that would have caused the brakes to overheat? stuck caliper? track day?
If none of the above, I would think master cylinder. Although clogged/failed ABS pump is typical in cars that have gone years without a brake system flush, I just done see how it would cause the symptom you describe.
Just my 2 cents....
When did this start happening? anything done prior?
Anything that would have caused the brakes to overheat? stuck caliper? track day?
If none of the above, I would think master cylinder. Although clogged/failed ABS pump is typical in cars that have gone years without a brake system flush, I just done see how it would cause the symptom you describe.
Just my 2 cents....
03-11-2014, 02:54 PM
#3
Race Car
Year etc of you car will be helpful. Did the dealer have a look at the car or is he making an assumption based on your experience?
The C2's have a simplified brake system, over the Turbo/C4/C4s systems.
if it is a Turbo/C4/C4s these have number of additional areas that need be checked. The pump and pressure accumulator are parts that need to be assessed. A full and proper brake bleed including bleeding the pressure accumulator should also be done to ensure the system is operating correctly.
A friend recently replaced his pressure accumulator and he said the difference in feel was night and day from previous.
If it is a C2, did you have a calliper off recently (or Clutch) that would have drained the system past the ABS pump? Do you have a leaking calliper anywhere?
The C2's have a simplified brake system, over the Turbo/C4/C4s systems.
if it is a Turbo/C4/C4s these have number of additional areas that need be checked. The pump and pressure accumulator are parts that need to be assessed. A full and proper brake bleed including bleeding the pressure accumulator should also be done to ensure the system is operating correctly.
A friend recently replaced his pressure accumulator and he said the difference in feel was night and day from previous.
If it is a C2, did you have a calliper off recently (or Clutch) that would have drained the system past the ABS pump? Do you have a leaking calliper anywhere?
