Reverse Gear Brake

Required special tools and equipment:





^ VW 309 Fixture
^ VW 313 Support clamp
^ VW 353 Transmission support
^ VW 402 Press plate
^ Depth gauge
^ Straight edge
^ Feeler gauges

Components to adjust reverse gear brake -B1-, overview





1 Transmission housing
^ With input gear and planet carrier installed
2 Shim
3 Outer plate -B1-
^ Quantity - Refer to Specifications
4 Inner plate -B1-
^ Quantity - Refer to Specifications
5 Pressure plate
^ Install with flat side facing plates
^ Spare part must comply with transmission code letters
6 Dished washer Rounded side points toward free wheel
7 Free wheel with -B1- piston

Note:
Before removing or installing free wheel, remove valve body and take out sealing plugs.
8 Circlip





Shim -A-, determining thickness
To measure shim thickness, the transmission housing must be clamped into assembly stand so that the input gear is facing downward, as shown.
Shim thickness is determined by gap "Y" and selected from table.
x = k + 1/2 - m
^ A = Shim
^ x = Gap
^ l = Position of piston in free wheel
^ m = Height of plate set including pressure plate
^ K Constant = 26.9 mm
^ "K" is determined by the installation height in the transmission housing and is not adjustable.

Calculating "I":





^ Press piston in direction of arrow to stop.
^ Place straight edge "A" onto outer race of free wheel.
^ Measure to inner edge of piston with depth gauge "B".

Calculating "m":





^ Place straight edge "A" on thrust plate.





^ Compress set of plates including pressure plate in direction of arrow and measure the thickness of plate set with depth gauge "B"
^ Determine size of shims according to table:





Table of shims:

^ Select shims according to the listing in the table. Determine Part No. from parts catalog.
^ After determining shim for -B1-, check measurement.

Reverse gear brake -B1-, checking measurement
^ Install parts except free wheel and secure with circlip.





^ Measure play between plates with feeler gauge -A-.
Play:
inch = 1.25 mm
max. = 1.55 mm