Chevrolet Cobalt Service & Repair Manual: Brake Drum R&R

1. Raise and support the vehicle.
2. Remove the tire and wheel assembly.
3. Remove and discard the brake drum retainers (1), if equipped, Fig. 1.
4. Remove the brake drum (1), Fig. 2.
5. If reinstalling the brake drum, use the J-41013 Rotor Resurfacing Kit to clean the wheel hub flange mating surface of the brake drum of any corrosion.
6. Reverse procedure to install, noting the following:
  a. Adjust the drum brakes.
  b. Ensure the park brake lever is in the fully released position.
  c. Release the park brake lever boot from the floor console by applying light pressure inward on the sides of the boot retainer.
  d. Pull the boot away from the console to expose the front park brake cable adjusting nut (1).
  e. Release the tension from the park brake cable system at the front cable adjusting nut.
  f. Using only hand tools, loosen the adjusting nut completely to the end of the front cable threaded rod.
  g. Position tool No. J-21177-A drum to brake shoe clearance gauge to widest point of the brake drum inside diameter and firmly hand tighten the set screw on tool No. J-21177-A drum to brake shoe clearance gauge .
  h. Remove tool No. J-21177-A drum to brake shoe clearance gauge from the brake drum and position it over the corresponding brake shoe assembly at its widest point, Fig. 3.
  i. While holding tool No. J-21177-A drum to brake shoe clearance gauge in position, insert a 0.015 inch feeler gauge between one side of tool No. J-21177-A drum to brake shoe clearance gauge, and the corresponding brake shoe lining.
  j. Rotate the brake shoe adjuster screw until the brake shoe linings contact tool No. J-21177-A drum to brake shoe clearance gauge and the feeler gauge. Specification brake shoe lining-to-drum clearance: 0.015 inch.
  k. Repeat the above steps for the opposite brake drum and brake shoe assembly.
  l. Install the rear tire and wheel assemblies.
  m. Lower the vehicle.
  n. Position the park brake lever boot to the floor console and press the boot retainer into place to secure.
  o. Apply the brakes two or three times to seat and center the brake shoes on the brake drum.

Fig. 1 Brake drum retainer replacement

Fig. 2 Brake drum replacement

Fig. 3 Drum brake adjustment

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