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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 146,342 (57,000–287,000)
9 model years affected: 1992, 1993, 1994, 1997, more1999, 2000, 2001, 2003, 2004
39 people reported this problem
Viewing 1 - 14 of 14 comments
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.
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
abs light on & brakes act erratically
My son's car...Low speed braking ... abs engages, then '99 Blazer feels like it slides a little. Abs light not coming on. .. took to Matthews-Hargreaves Chevrolet in Royal Oak MI for repair... $105 for reading code, to be applied if repairs made for the amount of about $880, diagnosis was that it needed new ABS sensors. After repair was made, dealer called to say still not right, and that a fuse keeps shorting out. Will go back today to try to resolve through dealer, then through GM customer service. My son is not happy paying for an expensive repair that did nothing to fix the problem. I understand that this GM component has been a problem for a long time, but was never under recall.
ABS activating when stopping at slow speeds.. light on and off. Dealer says I need new sensors. Over 800 bucks for the job.
comes on and off auto zone test it and found it was front wheel sensors
Not for sure but I think my right front wheel sensor is giving me a problem.
brakes grind when stopping
Brought the blazer n abs light was on. Diagnosed as wheel censor. Had replaced. Light went off. Drove 2 feet abs came back on ,that's all the farther I got.
Abs light goes on and off,with system not working,a grinding sound sometimes..
Front ABS engages when pressing the brakes at random times, especially when turning the wheel and in light braking in wet conditions that normally wouldn't activate the ABS. The ABS warning light will also come on when pressing the brakes at random times with or without ABS engagement.
Abs warning light erractly goes in and out and now the brakes make a grinding noise from the real wheels.
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.
OBD CODE REPORTED PROBLEM WITH ABS SENSORS. ABS , (brakes), Operated erratically, (failed), in slick road conditions. 1999 Blazer, 4.3l 6 cyl.