If there are scuffs, deep scratches and other defects on the working surface of the disc that increase pad wear and reduce braking efficiency, as well as in case of increased lateral runout of the disc, causing vibration during braking, replace the disc. In specialized workshops, such a disc can be machined and polished on both sides to the same depth, but after processing, the thickness of the disc must not be less than the minimum allowable.
The minimum permissible thickness of the brake disc of the brake mechanism of the rear wheel is 9 mm. If one of the discs is less than specified, 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 assembly (refer to Rear Wheel Brake Caliper Replacement) and, without disconnecting the brake hose and parking brake cable, fix the caliper (e.g. wire) on the coils of the spring. Do not twist or strain the hose while doing this.
3. While holding the hub from turning with a mounting blade, as shown in the photo, loosen the brake disc mounting screw..
4….remove the screw…
5….and remove the brake disc.
6. Similarly remove a brake disk of the second brake mechanism.
7. Install the parts in the reverse order of removal.
NOTE: Before installing the disc, carefully clean the hub and disc mating surfaces of rust and scale, as even the smallest particle sandwiched between the mating surfaces will cause the disc to wobble and vibrate when braking.
USEFUL ADVICE: If you are installing an old disc, file the edges on the working surfaces of the disc, which have formed as a result of wear on the disc on both sides, with a file.
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