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Brake Rotor Thickness Measurement > < Fastener Tightening Specifications

Astra J

  • Brakes
  • Disc Brakes
  • Diagnostic Information and Procedures
  • Miscellaneous
  • Brake Rotor Surface and Wear Inspection

Brake Rotor Surface and Wear Inspection

Warning:  Refer to Brake Dust Warning .
1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement or/and Rear Disc Brake Pads Replacement .
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Inspect the friction surfaces of the brake rotor for the following Braking Surface Conditions:
  •  Heavy rust and/or pitting.
  •  Light surface rust can be removed with an abrasive disc. Heavy surface rust and/or pitting must be removed by refinishing the rotor. Refer to Brake Rotor Refinishing .
  •  Cracks and/or heat spots.
  •  Excessive blueing discoloration.
4. If the friction surfaces of the brake rotor exhibit one or more of the Braking Surface Conditions, the rotor requires refinishing or replacement. Refer to Front Brake Rotor Replacement , Rear Brake Rotor Replacement or Brake Rotor Refinishing .

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5. Using an appropriate tool (1) for measurement, calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves present on the rotor friction surfaces.
6. Compare the groove scoring depth recorded disc brake component Specifications.
7. If the brake rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the rotor requires refinishing or replacement. Refer to Front Brake Rotor Replacement , Rear Brake Rotor Replacement or Brake Rotor Refinishing .

  • Brakes
  • Disc Brakes
  • Diagnostic Information and Procedures
  • Miscellaneous
  • Brake Rotor Surface and Wear Inspection

Brake Rotor Thickness Measurement > < Fastener Tightening Specifications