Raise the rear of the vehicle.
Remove the plastic cap from the inside of each rear wheel.
Shine a flashlight into the inspection hole and determine the thickness of the block.
The maximum permissible thickness of the linings riveted to the pads is 3 mm. Accordingly, the protruding part above the rivet head is 0.5 mm. In this case, replace the pads.
The thickness of the new pads is 5 mm.
Removal the brake drum
Raise the rear of the car and remove the wheel.
Remove the brake drum retaining bolt.
If the drum cannot be removed manually, then put the adjusting eccentric back.
Remove the plug from the back of the brake mechanism shield and use a screwdriver to press the handbrake lever through the hole, which will pull back the return spring.
If necessary, loosen the adjusting nut on the handbrake lever.
The source is on the online website (OpelBook.ru)
Left: to facilitate the removal of the brake drum, use a screwdriver to press through the hole on the handbrake lever on the rear of the brake mechanism shield, which will pull back the return spring.
Right: checking the thickness of the lining on the rear drum brakes: Each brake shield has an inspection hole through which you can take a look at the brake linings.
Left: the arrow shows the fixing bolt that secures the brake drum to the wheel hub.
Right: when the brake drum is removed, we see the following components on the rear wheel brake:
1 - pressure springs;
2 - running shoe (primary shoe);
3 - wheel brake cylinder;
4 - adjusting fastening spring;
5 - push-off block (secondary shoe);
6 - handbrake control lever;
7 - lower return spring;
8 - upper return spring.
Loosen the tightly seated drum on the wheel hub centering belt using a plastic hammer.
Before installing the drum, lubricate the rear wheel hub belt with a thin layer of plastic grease for rolling bearings.
Adjust the handbrake if necessary.
Checking the condition of the brake drums
The friction surface of the brake drum should be as smooth as possible.
If there are grooves or deep hangnails (due to the pads being worn down to the rivets), then the drum can be bored.
The new brake drums have an internal diameter of 231 mm.
After boring, its internal diameter should be no more than 231.0 mm. Otherwise, both brake drums must be replaced.
With bored drums, larger size pads are used: 5.6 mm.
Dismantling the wheel brake cylinder of the drum brake
Remove the brake drum.
Unhook the upper brake shoe return spring and push the shoes outward.
Unscrew the brake pipe. If a new brake cylinder is not installed immediately after this, you must press the brake pedal and lock it (see "Work tip" in this chapter) in order to avoid unnecessary loss of brake fluid.
Unscrew the brake cylinder from the brake shield.
Before installation, turn back the adjusting eccentric. After assembling the brake shoe, adjust, see the next section.
Tightening torques: brake cylinder on the brake mechanism shield - 9 Nm, brake pipe on the brake cylinder - 16 Nm.
Bleed the brake system.
Removal brake pads
Remove the brake drum.
Using both hands, push the brake shoes toward the front of the vehicle to prevent the adjusting retaining spring from damaging the wheel brake cylinder boot when removed.
Use pliers to unhook the adjusting mounting spring at the top and remove it together with the upper return spring.
Also remove the spring and the adjusting lever.
Remove the retaining pressure springs. To do this, press the spring plate with pliers and turn it 90°. At the same time, press the retaining pins at the back of the brake shield by hand so that they do not rotate either.
Remove the brake shoes from the wheel brake cylinder.
Unhook the handbrake cable.
Before installation, clean the brake anchor plate with a soft metal brush and lubricate the mating surfaces with anti-squeak paste.
When installing, please note: the adjustment devices have right- and left-hand threads. Do not confuse the mounting side.
Check the free play of the gear and adjusting lever; clean if necessary.
Turn the gear back until it stops.
Lightly lubricate the push rod threads.
Install the brake shoes. When installing, first hang the lower side of the adjusting mounting spring. Use pliers to hang the upper return spring on the adjusting mounting spring. Now hang the adjusting mounting spring as described above.
Install the brake drum.
After installation, press the brake pedal until the audible jumping of the adjusting lever on the gear stops on both rear wheels (for this you need an assistant).
Adjust the handbrake if necessary.
When removing the brake pads, you need to remove the adjusting mounting spring. To do this, rest the gas wrench against the wheel hub. When removing the spring, make sure that (to avoid damage to the wheel brake cylinder cuff).
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