Brake Master Cylinder: Service and Repair

Removing And Installing Stepped Tandem Master Brake Cylinder







DANGER:
- Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid
- Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.

CAUTION:
- See notes on brake fluid
- See notes on repairs to brake system
- The switchover master brake cylinder must not be repaired
- Models 129.076, 140.04/05/06/07
- Do not tilt the tandem master brake cylinder, but pull it straight out towards the front, otherwise the thrust rod is forced out of its axial position and may break away from the retaining lugs on the master control unit

NOTE:
- Notes if loss of brake fluid is not visible externally
- Detach electronic accelerator by unscrewing two nuts on the accelerator pedal bracket
Model 170.435

After installation
- Bleed brake system

1 Tandem master brake cylinder
2 Brake lines
3 Brake lines
9 Reservoir plug
16 Brake booster
17 Sealing ring
- Replace sealing ring.

19 Nuts, tandem master brake cylinder to brake booster
20 Pre-bleed master brake cylinder at bleed screw
- Model 140

Y61 Master brake cylinder switchover valve