A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Install pressure nut - 1 - in brake caliper as far as stop and then loosen pressure nut a quarter turn.
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Insert protective cap in brake caliper groove. Use Trim Removal Wedge (3409) to do so.
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Carefully slide brake piston into brake caliper. Move brake piston when doing so. Brake piston must be guided over pressure nut, this is only
possible in four positions.
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After brake piston has been guided onto pressure nut, press it as far as stop into brake caliper.