S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Brake Caliper: Service and Repair
Front Brake Caliper, Servicing
Double piston brake caliper, front, repairing (S4/S6 models)
CAUTION: When repairing, use all the parts in repair kit.
Note:
Coat brake cylinder, piston and piston seal lightly with brake assembly lube.
1. Dust cap
Install on bleeder valve
2. Bleeder valve
Coat threads lightly with brake assembly lube
3. Brake caliper housing
CAUTION: Do not separate the halves of the caliper housing (with internal serrations) from each other If the protective cap for the guide bolts
is damaged, replace the brake caliper
4. Piston seal
Remove with screwdriver ~ Fig. 2
Install carefully by hand
5. Piston
Force out of brake caliper housing with compressed air ~ Fig 1
WARNING: Risk of accident! Apply pressure gradually. Guard against sudden release of the piston.
Place wooden board into the recess of the caliper housing to catch the pistons so that they are not damaged ~ Fig. 1.
Piston diameter: 42.8 mm (1.685 in)
Installing ~ Fig. 3, Fig. 4 and Fig. 5
Coat piston with brake assembly lube
6. Piston outer seal
Installing ~ Fig. 4