Removing
Arrangement of details of the parking brake mechanism on the left side of the car
1 - support; 2 – a fastener of a back nave; 3 - parking brake pads; 4 - adjusting flanges; 5 - adjusting ring; 6 - regulator body; 7 - spring holding the brake pads; 8 – a bolt of fastening of a cable; 9 - pin; 10 - sliding lever; 11 - bolts; 12 - upper return spring; 13 - lower return spring
Removing the springs holding the brake pads
Removing the parking brake lower return spring
Removing the brake pad assembly from the rear parking brake
1. The parking brake works independently of the hydraulic brake system. In this case, drum-type brake shoes are used, and the inner part of the brake disc is used as the brake drum.
2. Remove the rear brake disc and mark the location of all parts of the brake mechanism (see fig. Arrangement of details of the parking brake mechanism on the left side of the car).
3. Using pliers, remove the brake pad fixing spring plate by pressing the plate and turning it 90°. Remove the spring from the brake shield. Access to the springs is through the holes for the wheel bolts in the flange of the rear wheel hub (see fig. Removing the springs holding the brake pads).
4. Carefully remove the parking brake shoe lower return spring. At the same time, note the location of the spring, as it is not symmetrical (see fig. Removing the parking brake lower return spring).
5. Remove the lower ends of the brake shoes from the sliding mechanism and, moving up, remove the brake shoes as an assembly (see fig. Removing the brake pad assembly from the rear parking brake).
6. Mark the location of the brake pads, then remove the upper return spring and separate the brake pads from the adjusting bar.
7. Check the brake pads for wear and contamination and replace the pads if necessary. It is also recommended to replace the return springs. Mercedes-Benz does not specify a wear limit for parking brake pads, but brake pads must be replaced if the pad friction layer thickness is less than 1.5 mm.
8. Clean and check the condition of the adjustment bar and sliding mechanism and replace if necessary. Lubricate the threads of the adjusting bar and sliding surfaces of the sliding mechanism.
Installation
Installing the lower return spring
When installing the lower return spring, the end with a large grip must be located on the upper brake shoe.
1. Clean the brake shield and apply a thin layer of high temperature grease to the contact points of the brake pads with the brake shield. Avoid getting grease on the working surfaces of the brake pads.
2. Assemble the brake pads and adjuster bar. In this case, the adjusting ring must be located on the front side of the brake mechanism. Install the upper return spring on the brake shoes.
3. Install the brake shoe assembly in place and align the lower ends of the shoes with the sliding mechanism.
4. Install the lower return spring. In this case, the end of the spring with a large grip must be connected to the upper brake shoe (see fig. Installing the lower return spring).
5. Check the correct location of the brake shoes on the brake shield and secure them with fixing springs.
6. Center the brake pads.
7. Install the brake disc and adjust the parking brake.