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Home >> Acura >> 2007 >> RL >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Conventional Brake Components) >> Rear Brake Disc Inspection >> Thickness and Parallelism

Thickness and Parallelism

WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise the rear of the vehicle, and support it with safety stands in the proper locations (see LIFT AND SUPPORT POINTS ).
  2. Remove the rear wheels.
  3. Remove the brake pads (see REAR BRAKE PAD INSPECTION AND REPLACEMENT  ).
  4. Using a micrometer (A), measure the brake disc/ drum thickness at eight points, about 45° apart and 10 mm (3/8 in.) in from the outer edge of the brake disc/drum. Replace the brake disc/drum if the smallest measurement is less than the maximum refinishing limit.

    Brake disc/drum thickness: 

    Standard: 8.9-9.1 mm (0.350-0.358 in.) 

    Max. refinishing limit: 7.5 mm (0.30 in.) 

    Brake disc/drum parallelism: 

    0.015 mm (0.0006 in.) max. 

    NOTE: This is the maximum allowable difference between the thickness measurements.
    Fig 1: Measuring Brake Disc Thickness
    G05461837Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. If the brake disc/drum is beyond the service limit for parallelism, refinish the brake disc/drum with a commercially available on-car brake lathe.
    NOTE: If the brake disc/drum is beyond the service limit for refinishing, replace it (see REAR BRAKE DISC REPLACEMENT  ).