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Home >> Buick >> 2018 >> Encore Preferred, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Diagnostic Information and Procedures >> Hydraulic Brake Component Operation Visual Inspection >> Drum Brakes

Drum Brakes

  1. GM2327960

    With the rear tire and wheel assemblies and the brake drums removed, visually inspect the wheel cylinder pistons boot sealing areas to ensure that there are no brake fluid leaks.

  2. If any evidence of a brake fluid leak is present, the brake wheel cylinder requires replacement.
  3. Using firm hand pressure, simultaneously and evenly apply force on both brake shoes in order to compress the wheel cylinder pistons into their bore.
  4. Evenly release the force from both brake shoes to allow the wheel cylinder pistons to return.
  5. If one or both of the wheel cylinder pistons did not exhibit unrestricted and even movement during apply and/or release of force, the wheel cylinder may require replacement.
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