I'd be grateful for a little advice on a mechanical issue for my 2000 Z71: the wheel speed sensor(s?) are malfunctioning, activating the "ABS" light and making braking funky: at slow speeds, the truck (believing the wheel was skidding) would release the brake and the car would keep rolling even with the brake pedal depressed. I pulled the ABS relay from the fusebox, and the brakes work fine (but without ABS or traction control working, of course).I've read elsewhere that the sensors just need to be removed and cleaned, but my (usually good!) mechanic says on this truck the sensor is integrated into the hub, and can't be r/r'ed separately. (Note that the '00 Z71 is mostly the same as the '99 Tahoe, NOT like the later, redesigned '00 Tahoes.) Is he right? Also, how can I tell WHICH sensor or hub needs to be repaired/replaced? Thanks!

 

You will have to have an abs code reader to tell you which speed sensor is the issue.

 

2x on needing a scan tool to read the ABS codes.
My old '99 Yukon had the front speed sensors integrated into the front wheel hubs. And yes, I had to replace them also.