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 MANUALSCADILLAC2005SRX AWD V8-4.6L VIN AREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLDISC BRAKE SYSTEMTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSBRAKE ROTOR THICKNESS VARIATION MEASUREMENT
2005 Cadillac SRX AWD V8-4.6L VIN A
Brake Rotor Thickness Variation Measurement
2005 Cadillac SRX AWD V8-4.6L VIN ASECTION Brake Rotor Thickness Variation Measurement
Brake Rotor Thickness Variation Measurement
Caution: Refer to Brake Dust Caution in Service Precautions.
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 Brake Pads Replacement - Front and/or Brake Pads Replacement - Rear.
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 (οΏ½ inch), 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:
Brake rotor maximum allowable thickness variation: 0.02 mm (0.001 inch)
6. Important: 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.
If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.
Caution: Refer to Brake Dust Caution in Service Precautions.
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 Brake Pads Replacement - Front and/or Brake Pads Replacement - Rear.
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 (οΏ½ inch), 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:
Brake rotor maximum allowable thickness variation: 0.02 mm (0.001 inch)
6. Important: 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.
If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.