check valve

1992 CADILLAC DEVILLE
135,000 MILES
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SEAN03
  • MEMBER
  • 523 POSTS
How do I know if my booster needs a new brake check valve. Thanks.
Jun 7, 2012 at 1:29 PM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
If the check valve goes bad, the braking effort would increase drastically with braking efficiency dropping badly. Engine would most likely idle erratically.

When vehicle is shut off, wait a few seconds and test the brake pedal. If the pedal is soft and starts to get hard with each subsequent depression of the pedal, the valve is good.
Jun 7, 2012 at 1:51 PM
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