Removing
1. Fully release the parking brake and loosen the drive cable, refer to Section Brake system checks. Parking brake adjustment.
2. Mark with paint the position of the rear wheels relative to the hubs. This will allow the assembly to install the balanced wheels in their original position. Loosen the wheel bolts before jacking up the vehicle. Raise the rear of the car, put it on stands and remove the rear wheels.
Attention! The operation of lifting and placing the vehicle on stands is dangerous! Therefore, before carrying out the operation, read Section Jacking and towing Introduction to leadership.
3. Remove the rear brake caliper, refer to the appropriate section.
4. Remove the brake disc, refer to the appropriate section.
Attention! Before removing the individual parts of the drum brake, remember their location. Use the brake on the other side as a reference.
5. Disconnect the return spring (1) from the brake pad (3) using special tongs (2) or screwdrivers.
6. Rotate the drive shaft flange (1) so that the threaded hole is above the compression spring (2).
7. Slightly compress the spring (2) using the MERCEDES-BENZ 040 tool (3) or a screwdriver to turn it 90°and remove.
Note. These tools can be made independently. To do this, weld a handle on one end of a bar of the appropriate diameter, and cut a groove about 4 mm deep and about 2.5 mm wide at the other end.
8. Similarly, remove the pressure spring on the second brake shoe.
9. Move both brake pads apart (1) and remove them through the drive shaft flange. Pay attention to the position of the adjusting mechanism, which is necessary for the subsequent correct installation.
10. Disconnect the return spring (4) from the brake pads and remove the adjusting mechanism (details 1 to 3).
11. Squeeze out your finger (5) on the lock (6) and remove the lock from the brake cable.
Installation
1. If the pads of used brake pads are burnt out, the pad coupling springs must also be replaced.
2. Apply a thin layer of grease to all bearing and sliding surfaces on the expansion lock. Use high temperature paste as lubricant (e.g. LIQUI MOLY LM-36, MOLYKOTE-PASTE-U or G-RAPID).
3. Disassemble the adjustment mechanism. Lubricate the threads of the pressure element with high temperature grease (1), as well as the cylindrical part of the adjusting gear (2).
4. Screw in the pressure piece (1) into the adjusting gear (2) and insert into the pressure sleeve (3). At the same time screw the pressure element completely.
5. Attach the parking brake cable with the pin to the spacer lock. After that, press the expansion lock in the direction of the brake shield. When installing, make sure that the movable element of the expansion lock points upwards.
6. Insert the adjusting mechanism between both brake pads so that the pressure element points in the direction of travel.
7. Connect the first return spring (4) with brake pad. Check if the connection is correct.
8. Stretch the brake pads, insert them through the drive shaft flange and connect to the spacer lock.
9. Insert pressure spring (1) with tool 040 MERCEDES-BENZ (3) or screwdrivers (2) through the threaded hole into the brake shoe, compress it slightly, turn it 90°and connect it to the locking ring. Check the correct connection of the spring. The pressure spring hook must be fixed on the inside of the brake shield.
10. Connect the pressure spring to the second brake shoe.
11. Depending on the version, the second tension spring has hooks of various sizes at its ends. Connect the second return spring to the spacer lock with a small hook behind the upper brake shoe. big hook (arrow illustration) connect with a screwdriver to the lower brake shoe.
12. Install the rear brake disc, refer to the appropriate section.
13. Install the rear caliper, refer to the appropriate section.
14. Reinstall the rear wheels so that the marks made during removal match. Pre-lubricate with a thin layer of bearing grease the centering belt of the wheel disk on the hub. Do not grease wheel bolts. Replace rusty bolts. Wrap bolts. Lower the car onto the wheels and tighten the bolts crosswise to 110Nm.
15. Adjust the parking brake, refer to Section Brake system checks. Parking brake adjustment.
Attention! Several times, firmly press the brake pedal until a noticeable resistance is felt. Thus, the brake pads are adjacent to the disc and occupy their working position.
16. Check the level of the brake fluid in the reservoir, if necessary add fluid to the MAX mark.
Check reliability:
- Are the brake lines secured?
- Is the brake hose fixed in the holder?
- Are the bleed fittings tight?
- Has sufficient brake fluid been added?
- With the engine running, check for leaks. To do this, press the brake pedal with a force of 200-300 N (20-30 kg) within 10 s. The pedal must not loosen. Check all connections for tightness.