1. Block the front wheels, then jack up the rear of the vehicle and support it on axle stands.
2. The thickness of the rear outer brake pads can be checked through the holes in the wheels. The inner pads can be checked through the holes in the back of the brake calipers using a mirror and flashlight.
3. If any pad is worn to the specified minimum thickness, replace all rear brake pads together.
4. If the thickness of the pads cannot be determined, remove both rear wheels for a more complete examination (photo).
5. Before removing the pads, first remove the wheels. If the pads are to be reused, mark them so that they can be reinstalled in their original position.
Caliper Teves
6. Remove the caps from the inner ends of the drive pins.
7. Using a socket wrench, unscrew both guide pins, but do not remove them from the rubber bushings.
8. Move the caliper slightly outward so that you can sink the piston into the hole and provide some clearance for the pads.
9. Turn the caliper back and support on one side, being careful not to deform the hydraulic hose.
10. Remove the brake pads from the caliper frame.
Caliper Girling
11. Loosen and remove both drive pin bolts (photo).
12. Turn the caliper back and support on one side, being careful not to deform the hydraulic hose (photo).
13. Remove the brake pads from the caliper frame. Also remove the heat shield (photo).
Teves and Girling calipers
14. Clean the caliper, piston, disc and pads from dust and dirt. Remove rust from pad and disc base plates.
Caliper Teves
15. Push the piston all the way into the cylinder using the G-clamp and bar.
16. Position the brake pads on the caliper frame.
17. Note that the new brake pad set includes four self-locking bolts that are only used with Girling calipers.
18. Position the caliper on the pads, then insert and tighten the two guide pins.
19. Install covers on guide pins.
Caliper Girling
20. Screw the piston into the cylinder so that new brake pads can be placed. On calipers with a piston diameter of 38 mm (with chassis 89JA225957), 38 instead of 36, Audi recommends using tool no. 3131. You can use circlip pliers instead (photo). Install heat shield.
21. Position the brake pads on the caliper frame.
22. Place the caliper on the pads.
23. Insert new drive pin bolts (available in a new set of pads) and tighten them with a tightening force regulated specification.
Teves and Girlittg calipers
24. Fully release the parking brake.
25. On one of the rear calipers, use a screwdriver to lift the parking brake lever from the limiter (photo). Now repeat the procedure on the opposite caliper and check if the first lever remains on the limiter. If not, the handbrake cable is adjusted too far, loosen the adjustment nut on the equalizer as needed.
26. Insert a screwdriver (with a diameter of at least 6 mm) between the rear hook of the spring and the rear roller of the brake pressure regulator (pic. 9.16).
27. With the engine off, pump the brake pedal forty times on calipers with 36mm pistons, or once on calipers with 38mm pistons.
28. Check that both rear wheels turn freely, then remove the screwdriver from the brake pressure regulator spring.
29. Lower the car to the ground.
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