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  #1  
Old 10-17-2014, 03:55 AM
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Brake noise

Hi all
So my 2001 WJ has developed a noise when I press the brake Pedal and hold it down in a certain position when stationary and when moving. It is loud and sounds like a balloon being deflated whilst stretching the neck. The brakes are also not as good as they use to be. Have checked fluid pads n disks: tick
Booster works as pedal does drop when engine is started but the pedal goes hard as soon as the engine is turned off. So question is
Check valve or booster or ?

Thanks Jon


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Old 10-17-2014, 06:52 AM
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Re: Brake noise

It sounds like you need brakes.........Have them checked out before they destroy the rotors.
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Old 10-17-2014, 07:44 AM
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Re: Brake noise

Since the brakes are not as good as they where before, and with the sissing sound, i would say that there is a leaking diaphragm inside the booster. If the checkvalve is bad, then the booster should work normally with engine on, but stop working as soon as the engine is off (and the vacuum goes away to the engine inlet via the not working checkvalve)
So i would say, get a new (or junkyard) booster.
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