Procedures

Removing and installing brake master cylinder

Removal






Note! The booster pump - arrow - remains fitted (installed) during removal and installation of the brake master cylinder in vehicles with PSM.






1. Remove cover - A - from the hydraulic unit/brake unit.

2. Remove brake fluid from reservoir using suction.






3. Remove suction line -2- of booster pump -1- in vehicles with PSM.

4. For vehicles with manual transmission, remove the clutch line at the reservoir.
- Press on the ring to do this (unlocking) and pull the line out of the reservoir at the same time.

5. Disconnect the electrical line (plug) on the reservoir.

6. Undo the brake lines on the brake master cylinder. Close the brake lines and the brake line connections with suitable plugs.






Note!
- -A- = Brake master cylinder fastening nuts
- -B- = Brake booster fastening screws (Torx)






7. Undo the fastening nuts -A- of the brake master cylinder. Pull out brake master cylinder.

Installation

1. Install in reverse order.

2. Bleed the brakes.

Note!
- First bleed brakes as usual!
- Only after this (after the conventional bleeding) should the return pump actuation be performed (continue bleeding) with the Porsche System Tester 2 in vehicles with TC (Traction Control) or the booster pump control in the case of vehicles with PSM! If this is not observed, damage can occur to the return pump/booster pump!
- To bleed at rear on right with running return pump (TC) or at front right with running booster pump (PSM), the bleeding device remains connected (switched on)! Bleeding pressure approximately 2.0 bar!

3. Bleed the clutch in manual transmission vehicles.

4. Carry out a function check of the brakes.