Parking Brake Shoe: Service and Repair

Removal
1. Remove the rear wheel. Open the plug connection on the wheel carrier and pull out the plug for the brake pad wear indicator.





2. With a screwdriver, turn the adjustment device towards .. release" through a wheel bolt threaded hole.
3. Remove the brake caliper from the wheel carrier and suspend it in the wheel arch (do not open brake hydraulics). First, pull out the electrical wires on the brake caliper holder and the brake pad wear wire on the wheel carrier holder.
4. Take off the brake disc after removing the countersunk screws. If a stuck brake disc cannot be removed by gentle tapping with a plastic hammer, evenly screw hexagon-head bolts into the two M8 threads of the brake disc, thereby pressing off the disc.
5. Remove compression springs, adjustment fixture and return springs. Remove parking brake shoes.


Installation
1. Lightly grease the adjustment device No. -2-, pins No. - 8-/No. -9- on the actuating lever (spreading lever) and the sliding surfaces of the parking brake shoes.





2. Install the actuating lever (spreading lever) No. -12-, brake shoes, return springs, compression springs and adjustment device. The spreading lever (No 12.) is a I-part assembly that cannot be disassembled. This assembly consists of parts No. -6-, No. -7- and No. -8-.

Note: The hook (the curved end of the spring) of compression spring No. -10- must point upward on the upper brake shoe and downward on the lower brake shoe.

3. Again check to ensure that the parking brake shoes, adjustment device, return springs, compression springs and spreading lever are positioned correctly, and adjust if necessary.





Note: Ensure that the hooks of the compression springs No. -10- correctly clasp the wheel carrier -A- (if necessary, check with the aid of a mirror).

4. Clean the levelling and centering surfaces on the brake disc and wheel hub. Then apply a very thin coat of Optimally TA to the centering surface on the wheel hub.
5. Fit the brake disc.

Note:
^ Do not confuse right and left brake discs during assembly.
^ Distinguishing characteristic: involute shape and spare part number (SP No.). The flat surface of the brake discs is marked with R = right or L = left.





^ Spare part on left-hand side - third group number is odd (SP No. Left brake disc: 996.352.405.00).
^ Spare part on right-hand side - third group number is even (SP No. Right brake disc: 996.352.406.00).

6. Adjust the parking brake shoes and parking brake cables. Fit the brake caliper. Tightening torque of the fastening screws: 85 Nm (63 ft. lbs.). Ensure that the brake hose and brake line are in perfect position.

Note: Replace the brake caliper fastening screws after each removal.