Contents: Removal and installation ⤓ Disassembly and assembly of the…⤓ Checking the working brake cylinder…⤓
Removal and installation
− Before you begin removing parts, perform the following operations.
a) Loosen the parking brake cable adjusting nut.
b) Drain the brake fluid.
− The parts are removed in the order of numbers shown in the figure "Rear drum brakes".
Rear drum brakes. 1 - brake drum, 2 - automatic adjuster spring, 3 - automatic adjuster lever, 4 - automatic slack adjuster assembly, 5 - lower shoe return spring, 6 - shoe support pin caps, 7 - shoe support pin spring, 8 - upper shoe return spring, 9 - brake shoe with lining assembly, 10 - brake shoe with lining and parking brake lever assembly, 11 - retainer, 12 - convex washer, 13 - parking brake lever, 14 - brake shoe with lining assembly, 15 - shoe support pin, 16 - brake pipe joint, 17 - brake working cylinder, 18 - hub cap, 19 - lock nut, 20 - hub, 21 - support shield brake mechanism.
- When removing parts, pay attention to the operation of removing the retainer.
Using a slotted screwdriver, spread the tabs of the retainer and remove it.
− Installation of parts is carried out in the reverse order of removal.
- When installing parts, pay attention to the following operations:
1. Installing the convex washer.
Install the convex washer as shown in the figure.
2. Installing the retainer.
Using pliers, install and tighten the retainer onto the pin.
- After completing the installation of the parts, perform the following operations:
- a) Adjust the travel of the parking brake lever.
- b) Fill with brake fluid.
- c) Remove air from the brake hydraulic system.
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Disassembly and assembly of the working brake cylinder
− The parts are removed in the order of numbers indicated in the figure "Disassembling the working brake cylinder".
Disassembling the working brake cylinder of the rear drum brakes. 1 - dust cover, 2 - piston assembly, 3 - piston, 4 - piston sealing ring, 5 - air bleed screw, 6 - brake cylinder housing.
Caution: Use only the special grease from the repair kit in the brakes.
− Installation of parts is carried out in the reverse order of removal.
- When installing the parts, pay attention to the operation of installing the piston and its sealing ring.
a) Before assembly, wash the piston and brake cylinder with alcohol or brake fluid.
b) Lubricate the piston sealing ring and the special tool with brake fluid.
Brake fluid type - SAE J1703 or FMVSS 116 DOT3 or DOT4
c) Place the piston sealing ring on a special mandrel so that the working (sharp) edge faces upward, and then, lowering it down the mandrel, install the ring in the piston groove.
Caution: To avoid twisting or distorting the piston seal ring during installation, lower it slowly and carefully, in one motion without stopping.
Checking the working brake cylinder (after disassembly)
Check for damage or rust on the walls of the working cylinder and piston. If any deviations from the norm are found, replace the working brake cylinder assembly.