Checking the thickness of the brake disc

1. Using a micrometer, check the disc thickness at 8 locations 45' apart and 10mm from the outer edge of the disc. Standard value: 28.0 nm, limit value: 26.4 mm.

• difference between values (at least 8 points) should not exceed 0.015 mm.

Attention:

• when installing a new brake disc, grind it on a special device to achieve the standard value; otherwise, the beating of the disc will be more than normal, which can lead to vibration;
• to avoid deformation of the rotor and inaccurate grinding, install washers under the nuts on the side of the brake disc (see picture); install all nuts and tighten them diagonally (criss-cross) torque 100 Nm.

2. If the disc is thinner than the minimum value, replace it. If the difference in thickness in different places of the new disc exceeds the prescribed value, grind it with a special device, and then check the thickness again.