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Unread 08-05-2011, 12:05 PM   #1
Hawk37
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2004 TJ Wrangler 
 
Join Date: Jun 2008
Location: Austin, Texas
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Brake Petal Whine

I've noticed recently, that after a complete stop the brakes make a high pitch whine while I switch from brake to clutch. The noise relates directly to the up travel of the petal. Is this a sign that my master cylinder is going out? Booster? I checked the reservoirs and the fluid is a little yellow, but its still full. Ideas?

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Unread 08-05-2011, 03:01 PM   #2
Mean Max
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1991 YJ Wrangler 
 
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Sounds like a bad booster. Squeeze the large vacuum line going into the booster with something to clamp it off & attempt to repeat the same scenario again. If there isn't any noise with the vacuum line clamped off, it's a bad booster.

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Unread 08-08-2011, 10:53 AM   #3
Hawk37
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I'll give that a try. Thanks
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