A8 Sedan V8-3.7L (AEW) (1997)
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Place protective cap with outer sealing lip on piston.
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Using 3409 wedge, insert inner sealing lip into cylinder groove.
Note: Hold piston in front of caliper housing for this procedure.
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Press piston into brake caliper housing using piston resetting tool.
Note: Outer sealing lip of protective cap will then engage in piston groove.