If there are any scoring, deep scratches or other defects on the working surface of the disc that increase pad wear and reduce braking efficiency, replace the disc. In specialized workshops, such a disk can be sharpened and polished. However, the thickness of the disc must not be less than the minimum permissible value. The disc is turned on both sides to the same depth.
You will need: a 7 mm wrench, a 17 mm socket wrench (head).
1. Remove the relevant wheel and brake pads.
2. Using a 17 mm spanner, unscrew the two bolts securing the brake shoe guide to the steering knuckle…
3. …and remove the brake mechanism assembly without disconnecting the brake hose from the wheel cylinder.
4. Hang the brake mechanism with a rope or wire from the front suspension strut. At the same time, make sure that the brake hose is not twisted or too stretched.
5. Clean the brake disc from dirt. Apply a liquid such as WD-40 to the areas where the disc meets the hub and to the guide pins. Wait a little while to let the rust dissolve.
6. Using a 7 mm spanner, unscrew the two guide pins…
7. …and remove the brake disc.
8. Install the brake disc in reverse order. If you are installing an old disc, use a file to remove the ridges formed as a result of disc wear on both sides.