ABS Warning Light On and/or Erratic ABS Operation on Chevrolet Blazer

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.

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Average mileage: 154,791 (57,000–260,000)
6 model years affected: 1992, 1993, 1994, 1997, more1999, 2001
12 people reported this problem
7 people shared problem details
1999 Chevrolet Blazer200,000
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.
3 people like thisFlag inappropiate
abs light on & brakes act erratically
3 people like thisFlag inappropiate
comes on and off auto zone test it and found it was front wheel sensors
1999 Chevrolet Blazer116,531
brakes grind when stopping
1997 Chevrolet Blazer137,000
Erratic activation of ABS during normal braking, all weather and road conditions. Braking functions normally, and then suddenly and randomly the ABS kicks in, which effectively stops all braking action. WAY too many near misses, so am junking this POS. With any luck a GM suit will be in front of me the next time this happens. My, that would be a shame.
1993 Chevrolet Blazer260,000
have repalced sensors and still have the abs warning light on this has had both me and my grandfather stumped any help would be great
1999 Chevrolet Blazer132,000
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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