Removing and installing hydraulic unit: Removal

NOTE: For the removal and installation of the hydraulic unit -D- the brake master cylinder -B- and the brake booster -C- remain mounted (installed). See Fig 1 .

Fig 1: Identifying Hydraulic Unit, Brake Master Cylinder And Brake Booster

Courtesy of PORSCHE OF NORTH AMERICA, INC.

1. Switch off ignition. Remove cover -A-  from the hydraulic unit/brake unit.
   Fig 2: Removing Cover From Hydraulic Unit/Brake Unit

   Courtesy of PORSCHE OF NORTH AMERICA, INC.
2. Hold down brake pedal with pedal holder, so that the brake fluid does not run out of the expansion tank completely.
3. To remove the hydraulic unit -D-  , carry out the following removal procedure:
   Fig 3: Identifying Hydraulic Unit

   Courtesy of PORSCHE OF NORTH AMERICA, INC.

• Undo the brake lines on the hydraulic unit.
• Remove the lines between the brake master cylinder intermediate piston circuit and the hydraulic unit.
• Close the brake lines and the brake line connections with suitable plugs.
• Disconnect plug from pressure sensor (vehicles with PSM).
• Unlock/disconnect the control module connector on the hydraulic unit. Cover the plug connection and the plug!

NOTE:

• In the case of assembly work on the hydraulic connections, the electrical plug connections on the hydraulic unit must always be connected!
• This prevents the plug connections on the hydraulic unit or in the plugs inside from being splashed with brake fluid or water!
• Any damp plug must be wiped dry before being disconnected from the plug on the hydraulic unit!
• Brake fluid on electrical contacts (even thinned brake fluid) leads to corrosion and may cause faults in the system!

• Undo and guide out the hydraulic unit. In the case of unfavourable tolerances, remove the hydraulic unit without the bracket for the hydraulic unit.