Contents: Removal ↓ Installation ↓
Removal
Loosen the wheel bolts, raise the rear of the car, and remove the wheels.
Caution: If the brake pads are to be re-installed, their location must be marked before removal. Swapping the pads, for example, swapping the outer pad with the inner pad or moving the pad from the right wheel to the left wheel and vice versa, is not allowed. Changing the location of the pads may result in uneven braking action. It is recommended to use only genuine VW/AUDI brake pads. The rear brake pads must be replaced as a set, even if only one pad has reached the wear limit.
Remove the handbrake cable from the caliper.
Unscrew the 2 caliper mounting bolts, holding the guide pins. Remove the caliper and hang it on a wire to the body so as not to squeeze the brake hose. Do not unscrew the brake hose, otherwise it will be necessary to remove air from the brake system.
Remove the brake pads.
Installation
Caution: When the brake pads are removed, do not depress the brake pedal, otherwise the piston will be pushed out of the caliper body.
Clean the guide surfaces or lining areas of the pads with a suitable soft metal brush or wipe with a cloth soaked in alcohol. Do not use solutions containing mineral oils or tools with sharp edges,
Before installing the pads, examine the brake discs by touch with your fingers to check for dents. Discs with dents can be ground down (workshop work), depending on whether they are thick enough. Always turn the discs on both sides and pay attention to whether there is enough wear reserve left after turning.
Measure the thickness of the brake discs, see below.
Check the dust caps for cracks. Replace damaged caps immediately, as penetrating dirt will quickly damage the caliper seal. In this case, the caliper must be removed and disassembled (workshop work).
Turn the piston to the right using the special VW-3131 key and screw it in under strong pressure. If there is no special tool, insert an iron plate into both of its grooves to screw in the piston.
Caution: The piston must not be pressed in with the return device, otherwise the automatic adjustment in the caliper will be disrupted.
Caution: When pressing the piston into the cylinder, the brake fluid from the brake cylinder is squeezed into the expansion tank. Monitor the fluid level in the tank and, if necessary, suck out excess fluid with a siphon.
For suction, use a bottle that was used to remove air from the hydraulic system, or a plastic bottle that has previously only come into contact with brake fluid. Do not use bottles intended for drinking liquids! Brake fluid is poisonous and should never be sucked out by mouth through a hose. After replacing the brake pads, the brake fluid level in the expansion tank should also not exceed the "MAX" mark, since the liquid expands when heated. Brake fluid leaking from the tank gets under the master brake cylinder, destroys the varnish coating and leads to corrosion.
Insert both brake pads into the brake shield. Make sure that both pressure springs are positioned evenly upwards and parallel to the upper edge of the pads.
Insert the caliper and secure it to the brake shield with new self-locking bolts to a torque of 35 Nm, while simultaneously holding the guide pins.
Please note: Each VW/AUDI brake pad repair kit comes with 2 new self-locking bolts for each caliper. These bolts must be used every time.
After each replacement of brake pads, perform a basic adjustment of the rear wheel disc brake.
Connect the handbrake cable to the caliper body.
Tighten the wheel. Lower the car and tighten the wheel bolts crosswise to 110 Nm.
Check the brake fluid level in the expansion tank and, if necessary, top up the tank to the "MAX" mark.
Caution: Press the brake pedal firmly several times until you feel a strong resistance. This will center the brake pads and position them according to the operating conditions.
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