A3 Quattro L4-2.0L Turbo (CBFA) (2009)
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Place protective seal with outer sealing lip on piston.
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Using trim removal wedge (3409), insert inner sealing lip into groove in cylinder.
When doing this, hold piston in front of brake caliper.
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Press piston into brake caliper with piston resetting tool.
The outer seal lip of protective cap thereby slips into groove on piston.