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.
Brake Disc Thickness Check
- Remove contaminants or corrosion from the brake disc surface.
- Use a micrometer to measure the brake disc thickness at minimum eight points which are 10 mm (0.39 inch) inward from its circumference.
Standard value:
26.0 mm (1.02 inches) < Front (Except RALLIART) >
24.0 mm (0.94 inch) < Front (RALLIART) >
10.0 mm (0.39 inch) < Rear >
Limit:
24.4 mm (0.96 inch) < Front (Except RALLIART) >
22.4 mm (0.88 inch) < Front (RALLIART) >
8.4 mm (0.33 inch) < Rear >
- If the brake disc thickness is worn beyond the limit value at more than one point, replace the brake disc and check its run-out.
NO RELATED
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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.