Sierra Classic 2500 4WD V8-8.1L (2007)
1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
2. Using a calibrated micrometer measure and record the lowest thickness of the brake rotor at 4 or more points equally spaced around the rotor.
Ensure that the measurements are only taken within the brake pad lining contact area and that the micrometer is positioned the same distance from
the outside edge of the rotor for each measurement.
3. Compare the lowest thickness measurement recorded to the following specifications:
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Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 inch)
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Rotor discard thickness 27.50 mm (1.082 inch)
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Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 inch)
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Rotor discard thickness 28.0 mm (1.10 inch)
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Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 inch)
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Rotor discard thickness 27.50 mm (1.082 inch)
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Rotor minimum allowable thickness after refinishing 37.0 mm (1.46 inch)
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Rotor discard thickness 36.50 mm (1.437 inch)
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Rotor minimum allowable thickness after refinishing 29.0 mm (1.142 inch)
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Rotor discard thickness 28.50 mm (1.122 inch)
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Rotor minimum allowable thickness after refinishing 19.0 mm (0.748 inch)
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Rotor discard thickness 18.50 mm (0.728 inch)
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Rotor minimum allowable thickness after refinishing 28.0 mm (1.102 inch)
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Rotor discard thickness 27.50 mm (1.082 inch)
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Rotor minimum allowable thickness after refinishing 29.0 mm (1.142 inch)
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Rotor discard thickness 28.50 mm (1.122 inch)
4. 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.
5. 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.
6. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.
Brake Rotor Thickness Variation Measurement
Brake Rotor Thickness Variation Measurement
Caution: Refer to Brake Dust Caution.
Important: 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. Refer to Front Disc Brake
Pads Replacement (1500 Series) Front Disc Brake Pads Replacement (25/3500 Series) and/or Rear Disc Brake Pads Replacement (1500 Series)
Rear Disc Brake Pads Replacement (25/3500 Series).
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
