If there are burrs, 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 (10.2 mm).
The minimum permissible thickness of the brake disc of the rear wheel brake mechanism is 10 mm.
Notes:
- The minimum permissible thickness of the rear wheel brake disc is indicated on its inner surface.
- 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 rear wheel brake caliper), without disconnecting the brake hose, the parking brake cable and secure it with wire. Do not allow the hose to twist or become taut.
3. Remove the guide from the steering knuckle (see Replacing the rear wheel brake caliper).
4. Loosen the brake disc mounting screw…
Original posted on the website OpelBook
5. …unscrew the screw…
6. …and remove the brake disc.
7. Similarly, remove the brake disc of the second brake mechanism.
8. Install the parts in the reverse order of removal.
The Opel Astra J can be equipped with wheels of two sizes: 15- and 16-inch. In this regard, some brake mechanism parts installed on different vehicle configurations have different sizes. In particular, the diameters of the brake discs of the rear wheel brake mechanisms are 268 and 292 mm for installation with 15- and 16-inch wheels, respectively. Keep this in mind when purchasing new brake discs.
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.
Note: 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 wear.
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