Rear wheel disc brake
- 1 - brake disc. Replace only complete on the entire axle. To remove, you must first disconnect the caliper.
- 2 - cap. Be sure to replace.
- 3 - twelve-sided nut, 175 Nm
- 4 - Phillips screw, 4 Nm
- 5 - wheel bolt, 120 Nm
- 6 - hub with wheel bearing
- 7 - bolt, 60 Nm
- 8 - shield
- 9 - trunnion
- 10 - beam
- 11 - hexagon socket screw, 8 Nm
- 12 - ABS speed sensor. Before installation, clean the intake hole and lubricate with AUDIG000650 grease
- 13 - brake hose
- 14 - hollow bolt, 35 Nm
- 15 - bolt, 65 Nm
- 16 - support. After repair, before applying the foot brake, first adjust the parking brake.
- 17 - brake pads. Replace only complete on the entire axle.
Withdrawal
Warning: If the brake pads are to be reinstalled, they must be marked before being removed. It is not allowed to change brake pads from outside to inside and vice versa or from left to right wheel. Changing pads can cause uneven braking. Be sure to replace all the pads at the same time, even if only one of them has reached the wear limit.
1. Mark with paint the position of the rear wheels relative to the hub. This will allow the assembly to install the balanced wheel in its original position. Loosen the wheel bolts with the vehicle on the ground. Raise the car, put it on stands and remove the rear wheels.
2. Release the parking brake cable. Remove clip -1- from the side. Press the lever at the caliper in the direction of the arrow and disconnect the brake cable -3-.
3. Disconnect the caliper at the top and bottom. While doing this, hold the guide pin with a wrench. Remove the housing, the brake hose remains attached.
4. Remove the caliper and tie it with wire to the body. The brake hose must not be under tension.
5. Remove the brake pads and retainers from the guide.
Installation
Warning: Do not press the brake pedal with the pads removed. Otherwise, the piston will be squeezed out of the body. In this case, remove the caliper in the kit and insert it into place in the service station.
6. Clean the guide surfaces and the chock seats in the shaft with a rag and alcohol. Do not use solvents containing mineral oils or sharp-edged tools for this.
Warning: Only use alcohol to clean the brake.
7. Before installing the pads, check the brake disc by feeling it with your fingers. If there are scuffs, the brake discs must be replaced.
8. Measure the thickness of the disc, if necessary, replace the worn discs, while referring to the subsection Checking the thickness of the brake disc.
9. Check for cracks in the piston boot. If there is damage, replace the dust boot immediately, as the penetrating dirt quickly leads to loss of tightness of the caliper. The caliper for this must understand (service station work).
10. Screw in the piston by turning it to the right (clockwise) special key AUDI-3272, applying considerable effort for this. Burtik (arrow left) tool must be in contact with the caliper. If the piston stroke is heavy, turn the flats with a 13 mm wrench (A) tool.
Warning: The brake piston must not be rotated with the piston return tool or hammer handle, otherwise the parking brake setting mechanism may be damaged.
Warning: The HAZET 4970/3 tool can also be used.
11. If a special tool is not available, fabricate a suitable steel plate and insert it into both grooves of the brake piston. Rotate the piston with a strong movement.
Warning: The rotation of the piston forces the brake fluid out of the brake cylinder into the reservoir. Monitor the liquid level in the tank, remove excess if necessary.
Warning: Use a plastic bottle designed for this purpose only to suck out the brake fluid. Do not use a drinking bottle for this! Brake fluid is poisonous. In no case should it be sucked off by mouth through a hose. Use a siphon for this purpose. After replacing the brake pads, the fluid level in the reservoir must not exceed the MAX mark on the reservoir, as the brake fluid expands when heated. Escaping fluid flows down the brake cylinder, destroying the coating and leading to corrosion.
12. Insert a new retainer into the guide.
13. Insert the brake pads into the guide. With new brake pads, remove the protective film on the back plate.
14. Install the caliper and tighten the new mounting bolts to 30 Nm.
Warning: The repair kit contains four self-locking bolts that must be installed.
15. Press the lever -2- at the caliper in the direction of the arrow and connect the parking brake cable -3-. Insert clamp -1- on the side of the support.
16. Adjust the parking brake, while referring to subsection Parking brake adjustment.
Warning: The brake pedal must only be depressed after the parking brake has been adjusted.
17. Install the rear wheels so that the marks made during removal match. Tighten the wheel bolts. Lower the vehicle onto the wheels and tighten the wheel bolts crosswise to 120 Nm.
Warning: Press the brake pedal hard several times until you feel a distinct resistance on the pedal. Thus, the pads will lie against the brake disc and take their place.
18. Check the brake fluid level in the reservoir. Top up to the MAX mark if necessary.
Warning: Do a Reliability Check:
- Are the brake hoses securely tightened?
- Is the brake hose secured in the holder?
- Are the bleed fittings tight?
- Is there enough brake fluid in the reservoir?
- With the engine running, check the system for leaks. To do this, press the brake pedal with a force of 200–300 N (20–30 kg) within 10 s. The pedal must not move. Check all connections for leaks
19. Carefully let the new brake pads run in. To do this, brake the car several times from a speed of 80 to 40 km / h by lightly pressing the pedal. Let the brake cool down between braking.
Warning: In some regions, brake pads must be disposed of as special material. Local authorities must inform drivers of permitted disposal sites.
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