Audi A8 2003 Workshop Manual page 97

– At this stage it should not be possible to remove the protective
cap from the brake caliper housing by hand.
– Apply a small amount of assembly paste to piston and seal
before inserting.
– Lift up piston with standard extension and ratchet attachment
as shown in illustration and press lightly onto protective cap.
Keep the piston straight to avoid damaging the seal.
– Inflate protective cap with compressed air (maximum 3 bar).
The protective cap will then locate around the brake piston.
Use jaw protectors
– Press piston into brake caliper housing by hand.
Note
The inner sealing lip on the protective cap will then locate in the
piston groove.
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with respect to the correctness of information in this document. Copyright by AUDI AG.
Caution
Before driving vehicle for the first time, make sure function of
brakes is OK.
Audi A8 2003 ➤
Brake system - Edition 03.2013
3. Brake calipers 2FNR 42 AL
91