Question about 1996 Chevrolet Blazer

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ABS works poorly

On damp, wet, or pebbles my ABS makes a lot of noise under the hood, pulsing probably, front brakes are useless, and my rear brakes are inadequate to stop the car (96 2 WD Blazer) in the usual time. Then the system seems to recover at the last second before I hit someone. How can I tell if it's the brain or a sensor. Is there a way to disconnect ABS - I'm in SO CAL and the roads are mostly dry - I'm not sure that ABS is necessary for my conditions.

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You can try unpluging the fuse under the hood for the ABS but your brake light and ABS light on the dash will come on.I'm in NH and it would fail the saftey inspection if either of thoughs lights were on during the inspection.See if this helps your problem but you most likely have a wheel sensor going bad in the ABS system.

Posted on Feb 03, 2010

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My Answer:

It appears that very possibly you have a bad ABS wheel sensor either up front (right or left side) if you only have Disc Brakes in the front and drum brakes in the rear, or else a bad ABS sensor in one of the rear wheels with a 4 wheel Disc Brake system.

The damp part was the giveaway, as if it's doing it in dampness then surely it'll do it when wet as well. That is a given!

Esp if it's not doing it in DRY weather.

If it's not a bad (leaky as from moisture getting inside it) ABS wheel sensor then it could just be chaffed wires coming off from one of the wheel sensors that's shorting to ground. Esp when it gets wet as from dew point moisture or from rain. Possibly, but somewhat doubtful.

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One thing you might do is pull the main wiring harness connector off of the ABS unit itself and check it for MOISTURE on the contacts. If any is found then that is your problem point.

Even if no moisture is spotted get a can of waterproofing spray from you local automotive parts store and spray out both sides of the ABS wiring harness connectors.

Since this is purely a MOISTURE related ABS Warning Light issue/problem it has to be one or the other and nothing else.

Sometimes it's best to check for this issue at night with a good bright LED type light, as then the MOISTURE will show up better then in the daytime.

If this fixes the problem please post the result.

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My Answer:

It appears that very possibly you have a bad ABS wheel sensor either up front (right or left side) if you only have Disc Brakes in the front and drum brakes in the rear, or else a bad ABS sensor in one of the rear wheels with a 4 wheel Disc Brake system.

The damp part was the giveaway, as if it's doing it in dampness then surely it'll do it when wet as well. That is a given!

Esp if it's not doing it in DRY weather.

If it's not a bad (leaky as from moisture getting inside it) ABS wheel sensor then it could just be chaffed wires coming off from one of the wheel sensors that's shorting to ground. Esp when it gets wet as from dew point moisture or from rain. Possibly, but somewhat doubtful.

If you just had the brakes serviced recently, and the problem started shortly there afterwords then I would definitely suspect the (a) wheel sensor.

If it's been a problem from DAY ONE, or even under the original warranty period then it needs to be fixed for FREE under that original warranty. No bones about it.

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One thing you might do is pull the main wiring harness connector off of the ABS unit itself and check it for MOISTURE on the contacts. If any is found then that is your problem point.

Even if no moisture is spotted get a can of waterproofing spray from you local automotive parts store and spray out both sides of the ABS wiring harness connectors.

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If this fixes the problem please post the result.

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