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Home >> Acura >> 2003 >> 1.7EL Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Front Brake Disc Inspection >> Thickness And Parallelism

Thickness And Parallelism

  1. Raise the front of the vehicle, and make sure it is securely supported. Remove the front wheels.
  2. Remove the brake pads (see Front Brake Pads Inspection and Replacement  ).
  3. Using a micrometer, measure disc thickness at eight points, approximately 45° apart and 10 mm (0.4 in.) in from the outer edge of the disc. Replace the brake disc if the smallest measurement is less than the max. refinishing limit.

    Brake Disc Thickness: 

    • Standard:  20.9-21.8 mm (0.82-0.86 in.)
    • Max. Refinishing Limit:  19.0 mm (0.75 in.)
    • Brake Disc Parallelism:  0.015 mm (0.0006 in.) max.
    NOTE: This is the maximum allowable difference between the thickness measurements.
    Fig 1: Measuring Disc Thickness At Points
    G01960887
  4. If the disc is beyond the service limit for parallelism, refinish the brake disc with an on-car brake lathe. The Kwik-Lathe produced by Kwik-way Manufacturing Co. and the "Front Brake Disc Lathe" offered by Snap-on Tools Co. are approved for this operation.
    NOTE: If the brake disc is beyond the service limit for refinishing, replace it (see KNUCKLE/HUB/WHEEL BEARING REPLACEMENT ).
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