Contents: Removal 🠛 Installation 🠛
Caution! On models equipped with ABS, before unscrewing the brake pipe couplings, disconnect the ground cable from the battery and do not reconnect it until the system has been bled. Failure to do so may result in air entering the hydraulic unit, which is very difficult to bleed (in some cases it is impossible) pump up.
Removal
1. Remove the brake drum as described in Section Removal, inspection and installation of rear brake drums.
2. Remove the master cylinder reservoir cap and re-tighten it, placing a piece of polyethylene underneath to create a tight seal and prevent fluid loss. Alternatively, clamp the hose with a hose clamp or a C-clamp.
3. Carefully unhook the upper tension spring from both shoes and remove it. Move the upper ends of the shoes away from the brake cylinder.
4. Wipe the area around the brake pipe union behind the slave cylinder and remove the union nut (refer to the accompanying illustration). Carefully separate the cylinder tube and plug the end to prevent dirt from getting in. Wipe up any spilled liquid.
5. On the back of the support shield, unscrew the two bolts securing the brake cylinder and remove the cylinder together with the sealing ring (where is available), being careful not to spill brake fluid on the brake linings.
6. It is impossible to disassemble the cylinder, since its components are not sold separately. If at least one of the components is damaged, the entire cylinder assembly must be replaced.
Installation
1. Make sure the mating surfaces of the backing plate and brake cylinder are clean and dry. On models where the cylinder has an O-ring, use a new seal. On other models, apply a small amount of sealant to the cylinder mating surface.
2. Spread the brake shoes and place the brake cylinder in the working position. Insert the brake pipe and screw in the connecting nut two or three turns.
3. Insert the two cylinder mounting bolts, tighten them securely, then tighten the brake pipe union nut to the specified Specifications effort.
4. Remove the clamp from the brake hose or the plastic from under the master cylinder reservoir cap.
5. Make sure the brake shoes are installed on the cylinder pistons, then carefully install the tension spring.
6. Install the brake drum as described in Section Removal, inspection and installation of rear brake drums.
7. Bleed the brake system (refer to Section Bleeding the brake hydraulic system). If precautions have been taken to minimize fluid loss, only the rear brake in question will need to be bled.