Brake problem

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July 1st, 2020, 2:30 PM

Jay Wooton

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Brake problem

1995 chevy gmt 400.
Brake problem
Pressing on brake pedal hear air hiss (under dash)? and idle goes up. Pedal is hard to push and brakes dont seem apply unless you push hard.Checked the check valve and engine vacuum. Any advice? Ty

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July 1st, 2020, 2:54 PM

kevinkpk

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Quote:

Originally Posted by Jay Wooton

My take is brake vacuum booster

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The following 2 users liked this post by kevinkpk:

oilcanhenry (July 1st, 2020), Sabino56 (July 21st, 2020)

July 1st, 2020, 8:52 PM

Jay Wooton

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Quote:

Originally Posted by kevinkpk

My take is brake vacuum booster

Ok. Ty for taking the time to respond. I appreciate it.

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July 21st, 2020, 4:54 AM

65BelAir_Oz

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Sounds like the daiphram in the booster is leaking. the rise in RPM is due to air leaking into the manifold making the fuel mixture lean which causes the engine to rev up.