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Brake pedal slowly leaks down

Tiny
HOOTERMAN10
  • MEMBER
  • 1996 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 152,000 MILES
I have 96 model gmc pickup and the brake pedal slowly leaks down.I have replaced brake booster and MC still have same problem does any one know if it could be my ABS unit failing? Is that a symtom of ABS unit?
Wednesday, June 9th, 2010 AT 7:05 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi hooterman10, Welcome to 2carpros and TY for the donation

If there's no leakage anywhere and was bleed properly could be the ABS unit-bleeding sequences start at the MC, ABS modulator then wheels. Could be the new MC leaking internally though its new-been here before
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
HOOTERMAN10
  • MEMBER
  • 10 POSTS
I have put 2 remanufactored and now a brand new MC Its got to be something else. Can I completely eliminate the ABS unit by installing a upper proportion valve?
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you bleed the modulator if not try bleeding it and see what happens-as for the proportioning valve never done it who knows it might work
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
HOOTERMAN10
  • MEMBER
  • 10 POSTS
I am told I need a scanner to open valves in ABS unit to purge air out does this sound right?
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Wednesday, April 14th, 2021 AT 1:36 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Yes sir
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Wednesday, April 14th, 2021 AT 1:36 PM

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