Brake Rotor/Disc: Testing and Inspection

Before this inspection, brake pads must be removed.
Check disc surface for scratches in wearing parts. Scratches on disc surface noticed at the time of specified inspection or replacement are normal and disc is not defective unless they are serious.
But when there are deep scratches or scratches all over disc surface, replace it. When only one side is scratched, polish and correct that side.

Disc thickness "a"
Standard: 22 mm (0.866 inch)
Service limit: 20 mm (0.787 inch)





Use wheel nuts and suitable plain washers to hold the disc securely against the hub, then mount a dial indicator as shown and measure the runout at 25 mm (0.98 inch) from the outer edge of the disc.

Limit on disc deflection: 0.15 mm (0.006 inch)

NOTE: Check front wheel bearing for looseness before measurement.