If there are scoring marks, deep scratches and other defects on the working surface of the disc that increase pad wear and reduce braking efficiency, as well as in the case of increased lateral runout of the disc that causes vibrations during braking, replace the disc. In specialized workshops, such a disc can be turned and ground on both sides to the same depth, but after processing, the thickness of the disc must not be less than the minimum permissible (24 mm). The minimum permissible thickness of the brake disc of the front brake mechanism when worn is 23 mm. If the thickness of one of the discs is less than the specified value, replace both discs. When replacing brake discs, be sure to replace the brake pads with a new set.
1. Remove the wheel from the side of the disc being replaced.
2. Remove the caliper (see "Replacing the front wheel brake caliper"), without disconnecting the brake hose, and secure it to the front suspension spring with wire. Do not allow the hose to twist or stretch.
NOTE: To be able to secure the caliper with wire to the front suspension spring, remove the brake hose retainer from the bracket slot on the shock absorber strut before removing the caliper.
3. Unscrew the bolt securing the disc to the hub...
4. ...and remove the disk.
5. Similarly, remove the brake disc of the brake mechanism of the other front wheel.
6. Install the parts in the reverse order of removal.
NOTE: Before installing the disc, thoroughly clean the mating surfaces of the hub and disc from rust and scale, since even the smallest particle clamped between the mating surfaces will cause disc beating and vibration during braking.
USEFUL TIP: If you are installing the same disc, use a file to remove the ridges on the working surfaces of the disc that have formed on both sides as a result of disc wear, otherwise, in addition to increased wear of the brake pad linings, braking will be accompanied by jerks.
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