Withdrawal
Remove the rear brake disc.
Disconnect the front return spring. Check return spring. Replace rusted and weakened springs.
Lightly press down on the pressure spring with a 5 mm allen key, turn 90° (¼ turn) and remove the spring from the brake shoe.
Also remove the pressure spring from the other brake pad.
Separate the brake pads from above and remove them downwards.
Check ease of movement and, if necessary, remove the expansion lock. To do this, pull part -1- back, press out pin -2- and remove part -3- from cable.
Installation
Be sure to replace the brake pads on both sides.
Apply a very thin coat of Molykote G to the work surfaces and the spreader pin.
(Drawing W 4479) Position locking pin with pin -2- from below on handbrake cable in correct position.
Move the mechanism -1- for setting the brake pads. Lightly coat threads with Molykote paste. Return the threaded element to the end.
Place the setting mechanism in the correct position between the brake pads. Connect return spring -2- (thinner spring) to the undersides of the brake pads.
Insert brake pads. From above, the brake pads must be inserted into the slots -arrows- of the expansion lock.
The gear of the setting mechanism must be facing the bottom so that it can then be adjusted from the outside.
Press the 2 pressure springs with a 5 mm spanner and turn them 90°at the same time. In the closed position, the markings on the bolt head are located as shown in the figure.
Connect the top return spring.
The brake pads -arrows- must rest against the support on the brake shield.
Install brake disc and rear wheel.
Adjust handbrake.
Note: If the hand brake pads have been replaced, they must be run in as follows. At a speed of approximately 40 km/h, carefully apply the handbrake until any braking occurs. While maintaining speed, tighten the handbrake lever by another 1 click and drive about 400 m in this way. Release the handbrake and allow to cool. It is recommended, regardless of the replacement of the pads, to do this once every three months, as this removes corrosion and friction products from the working surfaces.