Hello , I need some advice. Its a 1993 Z-28 ,I have an abs and brake light on, I changed all three abs sensors all fuses, all relays, all light bulbs, changed all the rotors and pads. Finally took it to chevy and got the abs system scanned. came back code 24 RR wheel speed erattic. I tested some wires for voltage. On the abs module under the hood on the drivers side there is a harness that connects to the abs module. It has 6 wires in it (black, black, green, orange, pink and gray). The pink one is the only wire that had no reading, what is this wire for and could this be my problem? Please help!!!!!!

 

You can go here and download a 93 service manual. The ABS system has countless pages for troubleshooting.