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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Disc Brakes & Drum Brakes) >> Adjustments & Inspections >> Disc Brake System >> Brake Rotor Thickness Variation Measurement

Brake Rotor Thickness Variation Measurement

WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Any disc brake rotor that exhibits thickness variation exceeding the maximum acceptable level must be refinished or replaced. Thickness variation exceeding the maximum acceptable level can cause brake pulsation.
  1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. See BRAKE PADS  under REMOVAL & INSTALLATION.
  2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
  3. Using a micrometer calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the thickness of the brake rotor at four or more points, evenly spaced around the rotor. Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 1/2 in. (13 mm), for each measurement.
  4. Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation.
  5. Compare the thickness variation measurement to the following specification. See THICKNESS VARIATION SPECIFICATION  .
    THICKNESS VARIATION SPECIFICATION

    Application In. (mm)
    Brake Rotor Maximum Allowable Thickness Variation 0.001 (0.025)
    6. NOTE: Whenever a brake rotor is refinished or replaced, the assembled lateral runout (LRO) of the rotor must be measured to ensure optimum performance of the disc brakes. See BRAKE ROTOR ASSEMBLED LATERAL RUNOUT (LRO) MEASUREMENT  .
  6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement. See BRAKE ROTOR REFINISHING  or BRAKE ROTOR REPLACEMENT  .
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