Wheel bearing replacement in a GM A-body with JM4 brakes
A common problem in many FWD GM cars with ABS is water intrusion into a front wheel bearing, causing the wheel
speed sensor to fail. The ABS malfunction indicator lamp is turned on, and a code 32 (left) or 33 (right) is set. The solution is to replace the hub and bearing assembly.
The parts and directions on this page should apply to 1991-1999 H-bodies, 1992-1999 C-bodies, 1992-1996 U-vans, 1992-1996 E-bodies, and 1994-1996 A-bodies.
General Motors SPO
Chicago Rawhide / SKF / NAPA
Federal-Mogul / BCA / National
Disconnect the brake line clip from the strut. Remove the brake caliper and brake rotor. The caliper does not need to be disconnected from the brake line; use a piece of wire to hang it out of the way. The caliper mounting bolts have 3/8 inch Allen heads.
Remove the axle nut.
Put the car in neutral.
Using the access holes in the hub, use a T-55 Torx socket to unfasten the hub/bearing assembly from the steering knuckle. Disconnect the electrical connector and remove it from its support.
Put the new hub/bearing assembly in the steering knuckle in the same orientation that the old one had. Use the three mounting bolts to drive it fully in (tighten one turn, proceed to the next bolt and tighten one turn, and so on until the assembly is fully tightened). Torque the bolts to 85 N·m. Do not forget to reinstall the support for the electrical connector before putting the bolts in.