Master Cylinder: Disassembly
- Power assisted master cylinders differ in external design and primary piston configuration from unassisted versions. Disassembly procedure is identical for all versions. Remove dust boot (if equipped). Remove pressure valves and stop light switches.
- Move primary piston assembly slightly into bore in order to remove piston stop screw. Hold down piston assemblies against spring tension to remove circlip and washer from end of cylinder. Cover end of cylinder with rag to catch any internal parts or brake fluid that might pop out after circlip is removed.
- Tap open end of cylinder to remove secondary piston assembly. Note location of primary and secondary return springs and piston cups for reassembly procedure. Also note difference in size and shape between components from primary and secondary circuits. Remove all external hardware from cylinder.
Courtesy of VOLKSWAGEN UNITED STATES, INC.