Car Problem Reports

Chevrolet Blazer ABS Front Wheel Speed Sensors May Fail

 
Chevrolet Blazer Problem
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Model Years Affected: 1992, 1993, 1994, 1997, 1999

Average Mileage: 195,889 mi (132,000 mi - 255,667 mi)

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The anti-lock brake system (ABS) front wheel speed sensors are prone to failure. When a sensor fails, the ABS warning light may illuminate and/or the ABS system may activate erratically.

  • abs light on & brakes act erratically

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  • Visitor, , 200,000 mi

    ABS warning light and ABS system kicking in randomly while braking right before a stop has been an ongoing problem since ~130000 miles. First time I've replaced the speed sensors on both front wheels, which solved it. I tell you, changing these sensors is not a walk in the park. It took me hours to do it, because of the difficculty of access to them. At the end of the following winter, same problem. Got tired of paying $60 a pop for each sensor and done some research. Found a publication from GM describing this problem, cause - rusty gasket that holds each sensor to a hub. Every time they rust out, the distance from the tip of the sensor to the gear inside the hub increases, causing erratic readings. I live in the "rust belt" and this made a lot of sense. Removed the sensors and voila, rusty gaskets. Replaced them with the ones I had laying around from the last time and problem solved.
    That was a several years ago, but now that the vehicle just turned 200000, the problem is back. Rust never sleeps. I'm facing the choice if either buying the speed sensors again and spending $120-130 on parts or hunting for those gaskets. No one seems to be selling them without the speed sensors.

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  • Visitor, , 132,000 mi

    OBD CODE REPORTED PROBLEM WITH ABS SENSORS. ABS , (brakes), Operated erratically, (failed), in slick road conditions. 1999 Blazer, 4.3l 6 cyl.

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