Contents: Removal ↓ Installation ↓
The rear wheel drum brakes are adjusted automatically. The pressure rod changes its position under the influence of the adjusting device and ensures a constant, structurally determined gap between the brake drum and the shoes.
For automatic adjustment, the pressure rod has a thread on which a gear sits. By rotating, the gear changes the position of the pressure rod. After pressing the brake pedal once, a gap is provided between the brake drum and the brake shoes.
If the brake shoe movement, as a result of brake lining wear, is greater than the specified clearance, the gear, under the influence of the adjusting lever and spring, rotates further by one tooth. The position of the pressure rod changes - the brake shoes are adjusted automatically.
Attention! Special pliers for brake springs, such as HA2ET 797, are best suited for removing springs. You can also use a gas wrench.
Removal
The order of removing springs
1. Remove the brake drum.
2. Remove the return spring (1). Remove the spring (2) of the adjusting lever. Use a screwdriver to completely unscrew the adjusting gear of the pressure rod (3) back. Remove the return spring (4) – see Fig. Procedure for removing springs.
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3. Press hard with a gas wrench on the pressure spring plate and turn it 90° (1/4 turn). While pressing, hold the pin on the back of the brake support.
4. Remove the second spring plate.
5. Spread the brake pads from above with your hands and remove them.
6. Remove the lower return springs.
7. Disconnect the handbrake cable.
Installation
Spring installation procedure
1. Install brake linings of only one quality. Clean the brake shoes and brake support. When the brake shoes are removed, do not press the brake pedal, otherwise the piston will slip out of the brake cylinder. If the brake cylinder is damp, overhaul it. Clean the thread of the pressure rod and lubricate. Clean the drums with traces of grooves. Always grind both drums of the axle.
2. Apply a thin layer of Malykote G6 paste to the threads of the pressure rod, the mating surfaces of the brake pads to the brake support, the ribs of the brake pads in the supports and the brake lever on the brake lever.
3. Place the handbrake cable on the brake shoe.
4. Install the lower return spring and place the brake shoes on the lower support.
5. Install the pressure rod with the adjusting gear on top between the brake shoes.
Note! The left rear wheel push rod has a right-hand thread, the right rear wheel has a left-hand thread. The bevel of the sleeve and the long journal on the push rod point to the brake support shield.
6. Install the brake pads onto the brake cylinder piston.
7. Insert the pressure spring pins from the rear through the brake shoes.
8. Install the compression springs. Install the spring plates with combination pliers and compress the spring while holding the pin at the back (see fig. Spring installation order).
9. Turn the spring plate 90° (1/4 turn) and stop.
10. Install the return springs in the sequence 4, 2, 1.
11. Perform basic adjustment of the rear wheel brakes.
12. Install the brake drum (see subsection 7.7).
13. Press the foot brake repeatedly and firmly. This will adjust the rear wheel brakes.
14. Install the wheel, paying attention to the markings. Remove the car from the jacks and tighten the bolts crosswise to 160 Nm.
15. Adjust the handbrake.
16. Check braking at medium speed. If the car pulls to one side during braking, determine the cause and eliminate it (see subsection 7.19).
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