Audi A8 2003 Workshop Manual page 93

– 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 protective cap.
– 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.
Caution
Before driving vehicle for the first time, make sure function of
brakes is OK.
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Audi A8 2003 ➤
Brake system - Edition 03.2013
2. Brake calipers FNR G60
87