The minimum allowable brake disc thickness is 10.6 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.
You will need a TORX T30 key.
1. Remove the wheel from the side of the disc being replaced.
2. Remove the caliper assembly (see «Front wheel brake caliper replacement»), without disconnecting the brake hose, and secure with wire without twisting or pulling the hose.
3. Remove the two screws securing the brake disc to the front hub...
4.... and remove the brake disc from the front wheel hub.
5. Similarly remove the right brake disk.
6. Install the parts in the reverse order of removal.
Note. Before installing the disc, carefully clean the mating surfaces of the hub and disc from rust and scale, as even the smallest particle sandwiched between the mating surfaces will cause the disc to beat and vibrate when braking.
Note. If you are installing an old disc, file the edges on the working surfaces of the disc that have formed on both sides as a result of wear with a file.