Rear wheel brakes С38
- 1 - Bolt, 35Nm. Self-locking, be sure to replace. When loosening and tightening, it is necessary to keep the guide pins from turning.
- 2 - Brake pads. Be sure to replace all 4 pads of one axle
- 3 - Bolt with a toothed shoulder, 75Nm. Be sure to replace
- 4 - Guide complete with guide pins and protective cover. Supplied as a spare part with lubrication. Install a repair kit if the protective covers are damaged. Use the supplied grease pack to lubricate the guide pins
- 5 - Bolt with a toothed shoulder, 75Nm. Be sure to replace
- 6 - Brake disc. Be sure to replace both brake discs of the same axle. To remove, first remove the caliper
- 7 - Caliper housing. To replace the brake pad, the hose is not disconnected
Caliper C38
Caution: Various rear brake designs are available. Therefore, first, with the help of an illustration, find out which version is used on your car.
Withdrawal
Caution: The operation of lifting and placing the vehicle on stands is dangerous! Therefore, before carrying out the operation, read Section Jacking and towing.
1. Raise and place the vehicle on stands.
2. Mark the direction of rotation on the tire. Loosen the wheel bolts. Raise and support the front of the car and remove the wheel.
Warning: Be sure to follow the instructions in Section In case of emergency.
Caution: If the brake pads are to be reinstalled, they must be marked when removed. It is not allowed to change places of external and internal brake pads, as well as their rearrangement from the right to the left wheel. Replace all brake pads on the front wheels, even if one side of the brake pad has reached its wear limit.
3. Turn out bolts of fastening of the case of a support. At the same time, keep the guide pins from turning.
4. Remove the caliper housing and remove the brake pads.
Installation
Caution: When the brake pads are removed, do not press the brake pedal, otherwise the piston may be squeezed out of the housing. In this case, it is necessary to remove the caliper and piston in the kit and hand them over for repair at a service station.
1. Press the piston into the housing.
Caution: Never apply pressure to the piston with a conventional tool or hammer handle, otherwise the parking brake adjustment mechanism may be damaged.
2. To unscrew, install the special tool AUDI-3272 so that its shoulder is adjacent to the caliper. Turn the handle to the left until it stops. Turn the spindle to the right and unscrew the piston.
3. If there is no special tool available, saw down the metal strip accordingly and insert it into both grooves of the piston. Turn the piston with effort in the opposite direction.
Caution: Turning the piston forces the brake fluid out of the brake cylinder into the reservoir. Monitor the liquid level in the tank, if necessary, suck it out.
Caution: To suck out the brake fluid, use a plastic bottle that is designed for this purpose only. Do not use a drinking bottle for this! Brake fluid is poisonous and must never be sucked out by mouth through a hose. Use a siphon for this. When replacing the brake pads, the brake fluid level in the reservoir must not exceed the MAX mark, as liquid expands when heated. Escaping fluid enters the main brake cylinder, destroys its coating and causes corrosion.
Caution: Use only alcohol to clean brakes. Clean the guide surface and seat of the pads in the body shaft with a rag. Never use a tool with sharp edges for this.
4. Reinstall the brake pads.
5. Install the caliper body and secure it with new self-locking bolts 35Nm.
Caution: The repair kit contains self-locking bolts that must be installed.
6. Observing the direction of rotation, fasten the wheels. Lower the car onto the wheels and only then tighten the mounting bolts crosswise to the torque 120Nm.
Caution: Press the brake pedal firmly several times while standing until resistance is felt. Thus, the brake pads are adjacent to the disc and occupy their working position.
7. Check the brake fluid in the reservoir, if necessary, add fluid to the MAX mark.
8. Gently let the new brake pads run in. To do this, brake the car several times from a speed of 80 to 40 km / h, gently pressing the brake pedal. Allow the brakes to cool between braking.
Caution: After installing a new brake pad, it must be run in. To do this, do not apply sudden braking unnecessarily for the first 200 km of the road.
Caliper C43 with automatic installation
Caution: There are different versions of the rear brakes. Therefore, first determine which version your vehicle has using the illustration.
Warning: This section only covers the differences with respect to the C38 rear brake. All safety instructions are retained.
Withdrawal
1. Fix the brake disc with one wheel bolt.
2. Remove the bolts from the caliper body using a wrench to hold.
3. Release the parking brake lever. Take out the lock washer on the holder (1) brake cable and disconnect the cable from the caliper.
4. Remove the caliper body and tie it with wire to the suspension so that the brake hose is not stretched or damaged.
5. Remove the brake pads.
6. Remove the guide brackets.
Installation
1. Screw in the piston by turning it clockwise using special tool 3272. The operation requires force.
2. Reinstall the shoe retaining springs.
3. Reinstall the brake pads. Make sure that the brake pads sit on their bearing surfaces.
4. Reinstall the caliper body and tighten the new mounting bolts to torque 35Nm.
Caution: Install the 4 self-locking bolts provided in the repair kit. Make sure that the brake hose is not twisted.
5. Connect the parking brake cable to the caliper and secure with a lock washer.
6. Adjust the parking brake, refer to Section Parking brake adjustment.
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