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Procedures



Removing And Installing Booster Pump For PSM

Four wheel drive vehicles







The booster pump -A- is located in front of the brake booster -C- in the 911 Carrera 4 and 911 Carrera 4S.

RWD vehicles







The booster pump -Arrow- is located on the opposite side of the hydraulic unit in the 911 Carrera.

Removing And Installing Booster Pump - Four Wheel Drive Vehicles

- Removal







NOTE: The booster pump -1- is removed with the holder -1a-.

1. Switch off ignition.







2. Remove cover -A- from the hydraulic unit.
3. For the removal of the booster pump, carry out the following removal steps:







- Remove suction line -2- for booster pump. Undo pressure pipe on the booster pump -3-. Close the lines and the pump connections with suitable plugs.
- Release plug -4- -Arrow- and disconnect. Remove connector housing rearwards from out of the holder -Directional arrow-.
- Remove connector on pressure sensor (only present with PSM 5.3).
- Undo the three plastic fastening nuts -5- and remove the booster pump -1- with the holder -1a-.

- Installation
1. Install in reverse order.
2. Bleed the brakes.







NOTE:
- First bleed brakes as usual.
- Do not carry out booster pump activation with the Porsche System Tester 2 until after this has been done (after conventional bleeding) as otherwise the booster pump can be damaged.
- To bleed at front on right with running booster pump, the bleeding device should remain connected (switched on). Bleeding pressure approximately 2.0 bar.

3. Carry out the following tests:
- Read out and erase the fault memory of the PSM control module with the Porsche System Tester 2. Carry out a static test.
- Then start the engine. The PSM-related lights in the instrument cluster must go out when the engine is running.
- Read out the PSM fault memory again. There must not be any stored faults.

Removing And Installing Booster Pump - RWD Vehicles

- Removal







NOTE: The booster pump -Arrow- is located on the opposite side to the hydraulic unit.

1. Switch off ignition.
2. Remove spare wheel and cover from the booster pump. Remove luggage compartment lining in the area around the booster pump.
3. For the removal of the booster pump, carry out the following removal steps:







- Undo the suction line for the booster pump and the pressure pipes on the booster pump -Arrows-. Close the lines and the pump connections with suitable plugs.
- Disengage the connector housing -Arrow- from the holder, unlock and separate the connector.
- Remove booster pump.

- Installation
1. Install in reverse order.
2. Bleed brakes.







NOTE:
- First bleed brakes as usual.
- Do not carry out booster pump activation with the Porsche System Tester 2 until after this has been done (after conventional bleeding) as otherwise the booster pump can be damaged.
- To bleed at front on right with running booster pump, the bleeding device should remain connected (switched on). Bleeding pressure approximately 2.0 bar.

3. Carry out the following tests:
- Read out and erase the fault memory of the PSM control module with the Porsche System Tester 2. Carry out a static test.
- Then start the engine. The PSM-related lights in the instrument cluster must go out when the engine is running.
- Read out the PSM fault memory again. There must not be any stored faults.
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