A8 Sedan V8-3.7L (AEW) (1997)
Fig. 4 Inserting inner sealing lip of protective cap using 3409 wedge
Note: Hold piston in front of caliper housing for this procedure.
Fig. 5 Screwing piston into brake caliper housing up to stop
Press powerfully on piston while screwing.
Note: Outer sealing lip of protective cap will then engage in piston groove.