Remember that the dust generated during operation of the brake mechanisms may contain asbestos, which is extremely harmful to human health. Never blow off dust with compressed air or inhale it - wear a protective mask or respirator when servicing the mechanisms. Never use gasoline or petroleum-based solvents to wipe brake system components - use only branded cleaning agents or methyl alcohol!
Removal
1. Unscrew the rear wheel mounting bolts, jack up the rear of the car and place it on supports. Remove the rear wheels.
2. Release the parking brake.
3. On models Corsa B and Tigra remove the hub cap with a screwdriver. Bend the locking pin with pliers and remove it, loosen the adjusting nut. Remove the brake drum. At the same time, make sure that the pressure washer and outer bearing do not fall.
4. On the model Combo loosen the brake drum lock screw and remove the drum. If the drum is firmly connected to the centering flange of the hub, lightly tap it with a plastic hammer. Wheel bearing model Combo is located in a separate hub, whereas on other models covered in this manual the wheel bearing is located directly in the brake drum.
Releasing the brake drum locking screw
5. If the brake drum cannot be removed, remove the plug on the back of the brake shield and use a screwdriver to press the parking brake lever so that it rests against the wall of the brake shoe. This will allow the return spring to pull the brake shoes back and allow the brake drum to be removed. If necessary, disconnect the parking brake cable.
Pressing the parking brake lever with a screwdriver
Examination
1. Sweep away any dust that has accumulated on the surfaces of the brake components.
Remember that the dust generated during operation of the brake mechanisms may contain asbestos, which is extremely harmful to human health. Never blow off dust with compressed air or inhale it - wear a protective mask or respirator when servicing the mechanisms. Never use gasoline or petroleum-based solvents to wipe brake system components - use only branded cleaning agents or methyl alcohol!
2. Check the condition of the inner working surface of the drum; if grooves or deep scratches are found, replace the drums of both brake mechanisms.
3. Minor defects can be eliminated by turning the drum, provided that the maximum permissible value of its diameter is not exceeded.
Both drums must be resurfaced to the same depth. The authors of this Manual recommend replacing the brake shoes after resurfacing the drums.
Installation
1. On models Corsa B and Tigra replace the serviceable wheel bearings from the old brake drums to the new ones (see section Removal and installation brake shoes).
2. On models Corsa B and Tigra install the brake drums and adjust the wheel bearing clearance (see section Replacing brake linings of drum brakes).
3. On the model Combo clean the threaded hole for the locking screw and, if necessary, carefully tap it. Lubricate the locking screw with a locking sealant, such as OPEL 1510177. Install the brake drum on the hub so that the hole for the locking screw matches the hole in the hub. Screw in the locking screw and tighten it with force 4 Nm.
4. Apply a thin layer of grease to the centering belts of the brake drums. Install the rear wheels, lower the car to the ground and tighten the wheel mounting bolts crosswise with force 110 Nm.
5. Press the brake pedal approximately 20-25 times until the clicking of the adjusting lever is no longer heard. This indicates that the brake pads have taken their working position.
6. Adjust the parking brake (see section Adjusting the parking brake drive).
7. Check the brake fluid level in the reservoir and, if necessary, top it up to the MAX mark.
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