ABS problem with GMC 2002 Sierra

Grinding noise , wheel bearing is bad . Take it to the repair shop right away .

Well, it could mean that the emergency brake has not been fully released.The ABS system light is on if something has occurred within the ABS system. Something faulty may have happened there, get it checked out!

This is a common problem with these trucks. You will need to set-up an appointment with the service Dept. at the dealership. There is an update for the ABS system. The function of this update is to reduce the sensitivity. When you get down to five MPH (with the brake applied) the ABS turns on (no light on dash) and you get the sensation of Sliding (braking is reduced).
This is assuming that the tires are the same size and pressure, And that there are no defects in the wheel speed sensors. Good-luck and please let me know what you decided to do and how it went.

There was a TSB on this issue with your Sierra, a faulty or dirty ABS sensor is the cause of this problem. The fix is simple, just clean the ABS sensor at the front hub with brake parts cleaner and inspect the wire leads. At worst you may have to replace the sensor it self. Good luck

SOUND LIKE THE ABS ELECTRO HYDRALIC CONTROL UNIT.THE DEALERSHIP HAS TO FIX.THEY HAVE THE EQUIPMENT TO CHECK OUT THE ABS BRAKES.

There's speed sensors at each wheel. You may have got some contamination in front of one of them... sounds like the abs is trying to compensate for un equal speed at each wheel... and something may be blocking a proper read at one of the wheels...

Wheel speed sensors misadjusted, damaged , or metal shavings and other debree, since they are magnetic can give false readings from one of the wheel circuits. Over sized tires can give of false speed readings as well. there are many other causes including bad relay, control module, e.t.c. It is best to have the proper scan tool to diagnose an ABS problem

find the relay for the abs motor, disconet the raley if motor is off replace the relay if on check for code on the abs system.

check system for trouble codes

Or you could just pull the fuse for the abs and not have abs but you won't wreck from pulsating pedal.