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Pressure accumulator for brake "B4" > < Housing cover for planetary gearing

A3 Mk1

Exploded view
   
Exploded view
1 - Housing cover
q   For planetary gearing
q   Modification and identification features → Anchor
2 - Piston
q   For pressure accumulator of brake „B2“
q   Open side faces towards cover -item 4-
3 - Spring
4 - Cover
5 - O-ring
q   Lubricate with ATF when fitting
6 - Circlip
7 - Thrust washer
q   Stick in housing cover with vaseline
8 - Outer O-ring
q   For „B2“ piston
q   Lubricate with ATF when fitting
q   2x with different diameters are included in clutch plate repair kit for brake „B2“
q   Installation position → Anchor
9 - Inner O-ring
q   For „B2“ piston
q   Lubricate with ATF when fitting
q   2x included in clutch plate repair kit for brake„B2“
q   Installation position → Anchor
10 - B2 piston
q   Piston diameter changed → Anchor
q   Remove from and insert in housing cover by hand

Housing cover and seals for piston of „B2“ brake
The clutch plate repair kit for the „B2“ brake → Electronic parts catalogue contains two pairs of O-rings for the „B2“ piston.
The two pairs of O-rings are colour-coded for identification.
Each pair consists of an inner and an outer O-ring.
   
The identification on the gearbox cover -arrow- indicates which pair is to be installed.
  N37-10315
–  If the identification on the gearbox cover is „PW001“-arrow-, install O-rings with white colour coding.
–  If there is no identification on the gearbox cover, install O-rings with yellow colour coding.
Installation position of O-rings → Anchor
Installation position of O-rings for piston „B2“
Having selected the pair of O-rings to be installed, lay them flat, one on top of the other, on a clean surface. They must not be twisted.
–  Lubricate O-rings with ATF before fitting.
  N37-10315
–  Fit smaller O-ring -1- on inside of piston and larger O-ring -2- on outside.
When fitted correctly, the square side of each O-ring -arrows- is located in the groove in the piston. The rounded side is visible on the outside.
Install piston as follows:
–  Carefully press piston into cover as far as stop, taking care to keep it straight.
–  When installing, make sure that O-rings remain in grooves in piston.
–  Turning as required, push piston further into cover until it engages positively in one of four possible positions.
The housing cover may now be installed → Anchor.
  N38-10058

Pressure accumulator for brake "B4" > < Housing cover for planetary gearing