Using a screwdriver, turn piston 9 and unscrew stop screw 3 from the piston. Remove seal 8 with support cup 7, spring 6 and crackers 5 from the screw. Disconnect stop ring 4 and stop screw 3.
Assemble the automatic device in reverse order, taking into account the following:
- tighten the piston stop screws to a torque of 0.4-0.7 kgf·m;
- slot A (see fig. 204) on the thrust rings should be directed vertically upwards, the deviation from the vertical is allowed no more than 30°. This location of the slot ensures more complete removal of air from the rear brake drive when bleeding it;
- to pre-compress the thrust rings, press the pistons into the cylinder body using a special device shaped like a cylinder with a conical inner hole;
- the force required to press the piston into the cylinder must be at least 35 kgf; if the force is less than 35 kgf, replace the thrust ring;
- when pressing the piston into the cylinder, it is necessary to maintain a size of 4.5-4.8 mm and 67 mm (maximum) (see fig. 204) for a free fit of the brake drum;
- before installing the parts in the cylinder body, lubricate them generously with brake fluid. After assembly, check the movement of each piston in the cylinder. They should move easily within 1.25-1.65 mm. Lastly, install the protective caps 2.