Servicing rear brake callipers — AUDI

Notes:

When carrying out repairs install all parts supplied in repair kit.
Apply thin coat of brake cylinder paste B 000 100 to brake cylinder, piston and seals.

Self locking bolt, 35 Nm
Always replace
When loosening and tightening counter hold on guide pin

Brake calliper housing with handbrake cable lever
Renew the brake calliper housing if there is a leak at the lever for the handbrake cable

Oil seal
Remove with a screwdriver => Fig.
3

Piston with automatic adjustment
Unscrewing from brake calliper housing =>Fig.
1
Screwing into brake calliper housing =>Fig.
5
Piston diameter 38 mm

Protective cap
Fit onto piston with outer sealing lip =>Fig.
2
Insert with inner sealing lip in groove in brake calliper housing => Fig.
4

Brake carrier with guide pins and protective caps
Supplied as replacement part, assembled with sufficient grease on guide pins
If protective caps are damaged install repair kit
Use grease sachet supplied to lubricate guide pins

Bleeder valve
Apply thin coat of brake cylinder paste to thread before screwing in

Dust cap
Fit onto bleeder valve

Guide pin
Grease before fitting protective cap

Protective cap
Pull onto brake carrier and guide pin

Fig.1
Unscrewing piston from brake calliper housing

Unscrew piston by turning the threaded spindle anti-clockwise and the knurled section clockwise. Pull out sealing lip with piston.

Note:

If piston is difficult to move, use a 13 mm AF open jaw spanner on the flats (arrow A) provided for this purpose.

Fig.2
Attaching outer sealing lip of protective cap to piston

Fig. 3
Carefully removing seal with screwdriver

Note:

Ensure that the surface of the cylinder is not damaged during removal.

Fig. 4
Inserting inner sealing lip of protective cap into the calliper housing groove using a screwdriver

Note:

Hold piston in front of brake calliper housing.

Fig. 5
Screwing piston as far as its stop into brake calliper housing

Screw in piston by turning the threaded spindle clockwise and the knurled section anti-clockwise.

Note:

The protective seal outer sealing lip will then locate in the piston groove.