Brake vacuum problem

CREEDALLEN2000

MEMBER
CHEVROLET S-10

I have a 96 s10 mi 120,000 when I first start the truck everything is fine after a few minuites of normal driving the brakes start to fail. Sometimes the petal is stiff with little of on brake application and sometimes the brakes grab. Also when ideling when the brake petal is pressed the engine idles up when the petal is released oil pressure drops and the engine dies. When the petal is held down and the engine is running a blowing noise is herd fron behind the brake petal. I would appriceate a little input on this problem thank you.

Thursday, October 4th, 2007 AT 4:31 PM

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Check the check valve! Thats the plastic piece on the booster, take it off and blow thru it air should pass only 1 way. If that's good shut off the truck pump the air out of the booster till the pedal is hard, hold the pedal down, and start the truck, if the pedal sinks the booster should be ok, Look for a large vacuum leak, under the hood. If the pedal stays hard, replace booster.

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Thursday, October 4th, 2007 AT 5:19 PM