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Brake booster check valve

Tiny
EMILY CHURCH
  • MEMBER
  • 1997 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 265,691 MILES
Replaced the front brakes. Back brakes are still good, as are the rotors. The problem I believe is the brake booster check valve. It is very hard to stop with the brake pedal, and the engine tries to stall out. I have checked auto part stores and the universal one is not the right size on the two port tubes that stick out on each end. And they all seem to think that because I am a female, that I really do not know what I am talking about. Any suggestions?
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Wednesday, August 1st, 2018 AT 11:03 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The check valve is for retaining vacuum in the booster when the engine is off. The vacuum will not bleed down when you start it.

If your pedal is hard, it is the booster itself and not the check valve.

Remove the check valve while it is running and check for vacuum at the valve. If there is, the booster is bad. If there is not then the check valve is bad.

Roy
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Tuesday, March 16th, 2021 AT 9:55 AM

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