When pressed while running goes all the way to floor?

Tiny
MIKEJUSTIN
  • MEMBER
  • 2003 CHEVROLET BLAZER
  • 4.3L
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
Hard full pedal with engine off, but when pressed while running goes all the way to floor with no resistance. New master cylinder and ABS.
Tuesday, August 28th, 2018 AT 6:45 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
This happens when the brake booster internal valve goes bad here are diagrams and instructions on how to change it out. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Wednesday, August 29th, 2018 AT 2:18 AM

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