A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Use protective backings
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It should no longer be possible to remove protective cap from brake caliper housing by hand.
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Thinly coat piston and seal with Assembly Paste before inserting.
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Lift brake piston, as shown, with commercially available extension and ratchet adapter and lightly press against protective cap.
Do not angle piston, to avoid damaging seal sleeve.
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Blow protective cap on with pressurized air (max. 3 bar). The protective cap will thereby jump over the brake piston.