Brake cylinder components: 1 - dust cap; 2 - air release valve; 3 - spring; 4 - wheel brake cylinder housing; 5 - cuff (lubricate with VW brake cylinder paste); 6 - piston (lubricate with VW brake cylinder paste); 7 - protective cap
Attention! When repairing, install the repair kit included in the kit.
Removal
Remove the brake drum.
Remove the brake pads (see section "Removal and installation front brake pads" or "Removal and installation rear brake pads").
Disconnect the brake hose from the wheel brake cylinder and close it with the dust cap from the air bleed valve.
Caution! No dirt must enter the hose!
Loosen the wheel brake cylinder mounting bolts and remove the cylinder.
Disassembly and assembly
The wheel brake cylinder can be disassembled in the installed position. Disassembling the cylinder is necessary if the cuffs are worn out or the piston is jammed. The cylinder must be replaced when scratches or signs of corrosion appear on it. It is not permitted to remove traces of damage by grinding. The cylinder must be replaced as a set, and its repair is carried out only in the rarest of cases. When making repairs, it is essential to use a repair kit, paying attention to choosing the correct diameter. There are acceptable tolerances for different vehicle variants.
Using a screwdriver, remove the protective cap, take out the piston with cuffs and the expansion spring.
Clean all parts with brake fluid or alcohol. Clean pistons should move in the cylinder with resistance.
Place new seals on the pistons; in this case, the long flange should be directed towards the cylinder. Lubricate the seals, pistons and brake cylinder with the original VW/Audi paste for brake cylinders.
Clean the air bleed valve hole and replace the valve if necessary.
Push the left piston into the wheel brake cylinder and put on the protective cap.
Insert the spring from the right and push in the right piston, put on the protective cap.
Installation
Install the wheel brake cylinder and secure it.
Connect the brake hose to the wheel brake cylinder and secure it (not too tight).
Install the brake pads.
Install the brake drum.
Adjust the brakes.
Conduct a brake test during a test drive.
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