GM 15693455
Brake Drum, Rear

Use vehicles stands to raise the vehicle and then perform steps for Brake Drum replacement. Position the vehicle on safety stands then take off wheel and tire. Mark the Brake Drum position related to the axle for reference. Pull off the rear Brake Drum when you sever its retaining hardware from the vehicle. Find the relationship mark then position the Brake Drum correctly on the axle before putting back the tire and wheel. Complete brake work then put away safety stands before letting the vehicle down.

You will need these tools to maintain or fix brake drums: Rotor Resurfacing Kit (J 41013). Rotor Resurfacing Kit (J 41013). Drum brake refinishing should never be performed to manage brake noise or issues with premature lining wear or cosmetic corrosion or drum discoloration. Proceed with refinishing operations only when drum braking surfaces show severe scoring or when brake pulsations appear from out-of-round conditions or when corrosion reaches below the braking surface. Begin by using a micrometer to measure the largest measurement of the brake drum. Replace the drum rather than refinishing it when its diameter surpasses the maximum allowed refinish size. The Rotor Resurfacing Kit (J 41013) enables complete removal of rust from the brake drum flange. All drum refinishing should follow brake lathe manufacturer specifications to create a top-quality stopping surface for vehicles. Apply 120 grit aluminum oxide sandpaper to produce a non-directional braking surface on the machined component before finishing with the use of brake parts cleaner (GM P/N 12377981 or equivalent).

In order to service and repair the brake drum, start by making sure that the brake drum can only be refinished under specific conditions, such as severe scoring or brake pulsation caused by too much runout, or deep corrosion. First, measure the highest diameter of the brake drum in the using to micrometer, If the maximum refinish diameter is being exceeded, discard the brake drum out and not refinish. In case of refinishing, resource to the Wheel Hub Resurfacing Kit (J42450-A) to remove the rust completely from the brake drum flange. After cleaning, it is time to refinish the brake drum as prescribed by the brake lathe manufacturer's operating instructions. Lastly, wipe the breaking surfaces with denatured alcohol before drying with non-lubricated, filter compressed air.

Clean the braking surfaces with GM P/N 12377981 or equivalent brake parts cleaner.

Remove the rear brake drum retainers.