Rear Brakes

Rear Brake Rotor: Inspection

Visual

Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace as necessary.

Runout

1) Attach disc rotor to wheel hub using wheel nuts at two or more positions.





2) Inspect runout using dial gauge placed at 10 mm (0.39 in) inside disc edge as shown.






NOTE:
Before measuring, make sure that wheel bearing axial end play is within the specification. Refer to Rear Axle Bearing On-Vehicle Service (C200), [Rear Axle Bearing: On-Vehicle Service] Rear Axle Bearing On-Vehicle Service (M226).

3) When runout exceeds limit value, displace mounting positions of disc rotor by one hole. And then find a position of the minimum value for runout.
4) If runout is outside the specified value after performing the above operation, refinish disc rotor using Tool.






Thickness

Check the thickness of the disc rotor using a micrometer. Replace disc rotor if the thickness is less then the repair limit thickness.