GM Service Manual Online
For 1990-2009 cars only

Visually check the caliper for fluid leakage through the housing. If the housing is craked or the casing is leaking, replace the caliper. Also, check for fluid leakage around the pistion area, past the seal and boot, and service the caliper as needed.

When parts are to be replaced in the caliper, follow the inspection procedures. Refer to Brake Caliper Overhaul .