RS 4 Quattro Sedan V8-4.2L (BNS) (2007)
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Push protective seal onto brake caliper housing so that it lies against the housing all round.
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It should not be possible to remove the protective seal from the brake caliper housing by hand.
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Apply a thin coat of lithium grease G 052 150 A2 to piston and seal before inserting.
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Lift up piston with standard extension and ratchet attachment as shown in illustration and press lightly onto protective cap.
Note:
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Make sure not to tilt piston to avoid damage to the seal.
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Inflate protective cap with compressed air (maximum 3 bar). The protective cap will then locate around the brake piston.
Use jaw protectors
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Press piston into brake caliper housing by hand.
Note:
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The protective seal inner sealing lip will then locate in the piston groove.