2001 Blazer 4x4 4.3 Vortec Abs light pops on and off and and abs activates about have the 50% of the time while braking no matter the road conditions.
Just resently I changed the driver side wheel bearing assembly, cv and front pads. And because of a time crunch at the shop I was bummin a lift at I didnt get to put in the new senser that came with. When it started doing this I made time to put the senser in, no change. I have tryed reseting the brain by disconecting the batt while at work, ten hours, still absing randomly. Oh yea and it doesn't matter light or hard brake pressure it stll does it. I would like suggestions on what I should do, zero money ideas first please. Thanks in advance. (CHEVY RUNS DEEP)

 

usually you need to find out which tire is the problem. at work we have a scanner that shows wheel speed of each tire, hook it up and drive it and will show you which one is off.

one free method you can try is try cleaning the mounting surfaces where the abs wire bolts to the bearing. i see alot of low speed abs activation due to the rust building up and actually lifting the wire upwards. but the only problem with that is you risk breaking the wire

 

Thanks for the tip, i think that very well could be it it was grimy around the mounting position, I am most definitely going to try that this weekend. I will let you know how it goes

 

I ended up using a playing card to make a shim in order to move the sensor tip away from the ring in the bearing assembly. when i pulled the wheel off i put my finger on the back of the sensor and about half way around while turning the hub I could feel it rubbing. I went out and drove around braking enough to heat up the breaks maybe a little too much, what a stink, but otherwise fixed. I even did some brake checks and sandy pave and the abs worked correctly in low traction, thanks again. My question is did the sensor ring get put in the bearing assembly off center, I guess thats what I get for buying the cheap part.

 

This just happened on mine abs kept not working and brakes would lock up, also light would come on and off randomly. It ended up being both front Hubs.

 

I have had the same problem with my 2001 blazer. Both the ABS and brake light turn on and off. What can I do to fix this? Any ideas on what the problem is?

 

check the front hubs

 

I had a Lumina van that did this
No bearing noise
Had it scanned and it said left front
Replaced that hub assembly but it still did it

I unplugged the ABS relay , puts the light on but doesn't make you shat your pants because your afraid its not going to stop

eventually other bearings started failing
After replacing the bearings I would reinstall the relay to test
Mine turned out being a rear