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07-06-2007, 10:21 AM
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Brake Booster
Good Morning Guys and Gals
I believe I have a bad brake booster, or at least a vacuum leak in the booster, however it still seems to work, and I have power brakes. The issue is I hear a continual hissing which gets worse as I step on the brake pedal. When this first started happening it wasn't making noise all the time, it only happened when I stepped on the brake pedal. I know the vacuum line runs outside the cab of my 87 Bronco, but this hissing noise is definitely coming form inside the vehicle. I would have thought with that much loss of vacuum (if that is what it is) it would be acting like I have manual brakes. Any ideas or explinations? Thanks for any help you can give me... 
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07-20-2007, 10:41 PM
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I would put a vacuum gauge on it and see how much vacuum you actually have ...
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07-21-2007, 04:32 PM
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You need to replace the booster. It has a leak in the diaphragm. The hiss you hear is air being drawn in through the valve that allows atmospheric pressure to the booster.
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