PSD Slave Cylinder Seal Kit - 90-95
PSD Slave Cylinder 928 332 775 09 sells for $435. This special seal kit allows you to rebuild the Slave Cylinder for a fraction of the cost.
The piston needs 4 seals. Center groove has a black O ring covered by blue seal.
The other two seals fit the outside grooves.
1990 to 1995 cars were fitted with PSD systems.