Measuring Rotor Thickness Variation (Front or Rear)

NOTE:
CHECK VARIATION WHILE THE BRAKES ARE COLD.

1. Remove the tire, caliper and brake pads. Install the wheel nuts onto the studs to hold the rotor positively in place. Tighten the nuts uniformly.

2. Clean the rotor with MOPAR brake parts cleaner p/n 04897150AA.





3. Draw a circle on the rotor that is approximately 10 mm (0.4 in) from the outer circumference with a waterproof marker by bringing the pen in contact with the rotor and rotating the rotor on the hub. Divide the circle into 8 equal parts (Figure 6).

4. Using a brake rotor micrometer, measure the disc thickness at each of the eight spots.

5. Calculate the variation by subtracting the smallest and largest measurement. Thickness variation should not exceed 0.01 mm (0.0004 in). If thickness variation exceeds this measurement, resurface the rotor with the on-car hub mounted brake lathe.