2000 Jimmy 4x4 Brake pedal Pops when raining - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-05-2015, 01:03 PM   #1
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Default 2000 Jimmy 4x4 Brake pedal Pops when raining

I had this Jimmy for about 6 months and only in the last couple weeks when it rains the brakes feel like they are skipping on the rotors because the Pedal Pops up when I apply . There pressure feels normal but the pedal pop back up like a pulse only stronger when starting to apply pressure. If I apply hard pressure it seems like it pops back less.
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Old 05-05-2015, 02:35 PM   #2
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Are you use to an ABS application on a brake pedal? If it only happens when raining, this could be normal......

Only TSB I've seen similar to this, is ABS activating when slowly coming to a stop......this is caused by corrosion build up between the sensor and the knuckle....
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Old 05-05-2015, 04:24 PM   #3
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Default Re:2000 Jimmy 4x4 Brake pedal Pops when raining

It has not happened behavior before raining or otherwise, so I don't beleive it is normal. I have had a simular action feel with traction control on my malibu but not with the brake pedal. This scares the crap out of me when it slips like that and I turn it off.

You comment about the TBS seems quite relevent, can I take a wirebrush and clean up the sensors, or would I have to replace them? I don't have any engine codes.
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Old 05-12-2015, 03:47 PM   #4
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What the TSB states, is remove the front sensors, clean the mating surface of the knuckle, by removing any rust build up, lightly coat with a rust inhibitor on knuckle surface, clean sensors(just remove dirt or metal shavings) and then reinstall the sensors....
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Old 05-13-2015, 12:16 AM   #5
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I agree with tech2. Another thing watch for is a loose hub bearing. My wifes blazer would do the same thing only at low speeds. Found a loose hub bearing causing the sensor too drop out at times.
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Old 05-13-2015, 11:53 AM   #6
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That'* a great tip on checking loose hub bearing.
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Old 05-13-2015, 01:39 PM   #7
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Pull the ABS fuse and see if the problem goes away. It won't fix the problem but it might tell you whether or not it is ABS related.
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