A3 Quattro V6-3.2L (BUB) (2008)
Check that the protective seal is completely seated:
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It should no longer be possible to remove protective seal from brake caliper by hand.
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Press piston lightly against protective cap and lock it into position, e.g. with trim removal wedge - 2 -.
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Blow protective seal on with pressurized air (max. 3 bar) - 1 -. Thereby the protective seal is forced onto piston.
Do not angle piston, to avoid damaging seal sleeve.
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Press piston into brake caliper with piston resetting tool - 1 -.