Question about 1999 GMC Jimmy

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The abs starts without steppin on the brake pedal Hard

The abs starts without steppin on the brake pedal hard , Replaced computer, pads roters, calipers the ABS light dont come on though.

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One of the speed sensors are bad. They do this when the air gap is too large. You will need a scanner to find out which one. But there are some ways you can figure it out without a scanner. It is usually a front sensor. Check the front bearings for play. Usually the one with play in it is the bad one. If non have play or noise coming from them. Just replace one, then drive it. If the problem is gone, good. If it isn't gone. Take the bearing you just took off and bolt it to the other side. Then it should be fixed.

Posted on Aug 01, 2010

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