Brake Booster Problem
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New User
Joined: Feb 2006
Posts: 14
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From: Medford, OR
Brake Booster Problem
My truck feels like I have the brake system off an old 50's boosterless pickup. There's a hissing coming from under the dash, or so it sounds. Anyone have ideas? Ever had this problem?
Senior User
Joined: Jun 2001
Posts: 200
Likes: 0
From: Davis, CA
Just a thought, I don't knokw what you've checked, but I have seen the grommet on the vac line input into the booster split, which will make that hiss sound very close to the dash, and will take away from the capability of the brakes.
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
there is a vacuum dump valve connected to the brake pedal, it has either lost its hold of the vacuum line, which by the way connects directly into the main brake booster line or the valve has seen better days..... clamp it off under the hood and see if you have brakes again and the hissing under the dast has ceased.... if the valve is N/S it can be removed from service as it only affects the quick release of the Cruise control
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Elder User
Joined: Oct 2004
Posts: 759
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From: Omaha
I would first check the check valve on the booster. Pop it off the booster and blow into both ends. If you can blow into it and it comes out the other end on both sides its defective.
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Elder User
Joined: Jan 2004
Posts: 805
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From: Pauline, South Carolina
Another possible problem is if the diaphram in the booster itself is busted. That will hiss as a result of the vacuum for boost pulling air through the diaphram. Basic answer is find the source of the hissing and you'll probably find your problem.
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