Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2004ENVOY 2WD L6-4.2L VIN SREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLDISC BRAKE SYSTEMTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSBRAKE ROTOR THICKNESS MEASUREMENT
2004 GMC Envoy 2WD L6-4.2L VIN S
Brake Rotor Thickness Measurement
2004 GMC Envoy 2WD L6-4.2L VIN SSECTION Brake Rotor Thickness Measurement
Brake Rotor Thickness Measurement
Caution: Refer to Brake Dust Caution in Service Precautions.
1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
2. Using a micrometer calibrated in ten-thousands of an inch, measure and record the lowest thickness of the brake rotor at four 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:
^ Front brake rotor discard thickness 27.5 mm (1.08 inch).
^ Rear brake rotor discard thickness 18.50 mm (0.728 inch).
4. If the lowest thickness measurement of the brake rotor is above the brake rotor discard thickness; the rotor may be refinished, depending upon the surface and wear conditions which may be present.
5. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.
Caution: Refer to Brake Dust Caution in Service Precautions.
1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
2. Using a micrometer calibrated in ten-thousands of an inch, measure and record the lowest thickness of the brake rotor at four 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:
^ Front brake rotor discard thickness 27.5 mm (1.08 inch).
^ Rear brake rotor discard thickness 18.50 mm (0.728 inch).
4. If the lowest thickness measurement of the brake rotor is above the brake rotor discard thickness; the rotor may be refinished, depending upon the surface and wear conditions which may be present.
5. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.