M45 V8-4.5L (VK45DE) (2006)
Brake Rotor/Disc: Testing and Inspection
Rear
DISC ROTOR INSPECTION
Visual Inspection
Check surface of disc rotor for uneven wear, cracks, and serious damage. Replace if there are.
Runout Inspection
1. Fix disc rotor to wheel hub using wheel nuts (2 or more positions).
2. Inspect runout using dial gauge. [Measured at 10 mm (0.39 inch) inside disc edge.]
Runout limit 0.055 mm (0.0022 inch) (With it attached to the vehicle)
NOTE: Before measuring, make sure that wheel bearing axial end play is within the specification.
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. Replace disc rotor if it is outside repair limit after performing the above operation.
Thickness Inspection
Check the thickness of the disc rotor using a micrometer. Replace disc rotor if the thickness is under the wear limit.
Standard thickness: 16.0 mm (0.631 inch)
Wear limit: 14.0 mm (0.551 inch)
Thickness variation: 0.015 mm (0.0006 inch) Measured at 8 positions)