CTS V6-2.8L (2006)
Brake Rotor/Disc: Testing and Inspection
JL9-16 Inch
Brake Rotor Thickness Measurement (JL9-16 Inch)
Caution: Refer to Brake Dust Caution in Service Precautions.
1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Brake Pads
Replacement - Front (JL9-16 inch) Brake Pads Replacement - Front (J56-Brembo) Brake Pads Replacement - Front (JE5-17 Inch) and/or Brake
Pads Replacement - Rear (JL9-16 inch) Brake Pads Replacement - Rear (J56 Brembo) Brake Pads Replacement - Rear (JE5-17 Inch).
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Using a micrometer calibrated in thousandths-of-a-millimeter, or ten-thousandths-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 13 mm (½ inch), for each measurement.
4. Compare the lowest thickness measurement recorded to the following specifications:
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Front brake rotor (CTS) minimum allowable thickness after refinishing: 30.7 mm (1.209 inch)
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Front brake rotor (CTS-V) minimum allowable thickness after refinishing: 31.0 mm (1.220 inch)
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Front brake rotor (CTS) discard thickness: 30.70 mm (1.209 inch)
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Front brake rotor (CTS-V) discard thickness: 30.00 mm (1.181 inch)
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Rear brake rotor (CTS) minimum allowable thickness after refinishing: 24.0 mm (0.944 inch)
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Rear brake rotor (CTS-V) minimum allowable thickness after refinishing: 27.0 mm (1.062 inch)
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Rear brake rotor (CTS) discard thickness: 24.00 mm (0.944 inch)
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Rear brake rotor (CTS-V) discard thickness: 26.00 mm (1.023 inch)
5. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification, the rotor may be
able to be refinished, depending upon surface and wear conditions which may be present.
6. If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification, the rotor may
not be refinished.
7. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement.
