GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Sonoma Pickup - 4WD 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Brake Drum Refinishing

Tools Required

J 42450-A Wheel Hub Resurfacing Kit

Caution: Refer to Brake Dust Caution in the Preface section.

Important: DO NOT refinish the brake drums in order to correct any of the following complaints:

   • A growl or squeal brake noise
   • Premature brake lining wear
   • Cosmetic or superficial corrosion of the drum braking surface
   • Drum discoloration
Refinish the brake drums ONLY when one or more of the following conditions exist:
   • Severe scoring where the groove depth exceeds the specification for the braking surface .
   • Brake pulsation caused by the following:
      - Brake drum runout in excess of specification
      - Corrosion or pitting that is deeper than the drum braking surface

  1. Use a micrometer in order to measure the largest diameter of the brake drum. If the largest diameter of the brake drum exceeds the brake drum maximum refinish diameter, DO NOT refinish the brake drum. Replace the brake drum.

    2. Object Number: 409878 Size: SH
  2. Use the J 42450-A in order to THOROUGHLY clean the rust from the brake drum flange.
  3. Refinish the brake drum. Refer to the brake lathe manufacturer's operating instructions.
  4. Using denatured alcohol, clean the braking surfaces.
  5. Using non-lubricated, filter compressed, dry the braking surfaces.