Removing Hydraulic Unit

Information 

• When fitting the hydraulic connections, the electric plug connections on the control units must remain connected as long as possible. This prevents the plug connections on the hydraulic unit or in the connectors inside from being splashed with brake fluid or water. 
• Any damp connector must be wiped dry before being disconnected from the connector on the hydraulic unit. If necessary, provide the connector with a suitable protector. 
• Brake fluid on electrical contacts (even thinned brake fluid) leads to corrosion and may cause faults in the system. 
• The brake lines must not be bent in the area of the hydraulic unit. 
• Clean the interfacing points of the brake lines, but not with cleaning agents. 
• Rinse off any brake fluid emerging thoroughly with water. 

see Fig 1 hydraulic unit is installed in the plenum panel on the front right, under the DME control unit.

Fig 1: Identifying DME Control Unit (Hydraulic Unit)

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Information 

• When fitting the hydraulic connections, the electric plug connections on the control units must remain connected as long as possible. This prevents the plug connections on the hydraulic unit or in the connectors inside from being splashed with brake fluid or water. 
• Any damp connector must be wiped dry before being disconnected from the connector on the hydraulic unit. If necessary, provide the connector with a suitable protector. 
• Brake fluid on electrical contacts (even thinned brake fluid) leads to corrosion and may cause faults in the system. 
• The brake lines must not be bent in the area of the hydraulic unit. 
• Clean the interfacing points of the brake lines, but not with cleaning agents. 
• Rinse off any brake fluid emerging thoroughly with water. 

1. Release the ground cable, unclip the wiring harness and set it aside.
   Fig 2: Locating Ground Cable

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Remove the support for the DME control unit -arrow-  .
   Fig 3: Locating DME Control Unit Support

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. Remove the housing of the intake air duct. To do so, loosen the two external fastening nuts and the two retaining clips in the inside of the air duct.
4. Provide a suitable protector for the control unit connector.
5. Activate the brake pedal by hand using the brake pedal loader, (do not clamp it yet!). Plug the vent hose of the vent bottle onto the front left and rear left bleeder screw of the brake calliper (2nd fitter required). Open the bleeder screws until the brake pedal is completely pressed down. Tighten the brake pedal loader and close the bleeder screws. This will close the central valves of the tandem brake master cylinder so that only a little brake fluid can flow out of the opened brake system.
6. A sufficient number of cloths should be put under the hydraulic unit to absorb any brake fluid emerging. If some runs into the plenum panel nonetheless, immediately rinse thoroughly with water.
7. see Fig 4 lines on the hydraulic unit (color marking, etc.) and remove. Seal the loosened lines with suitable plugs.
   Fig 4: Identifying Hydraulic Unit Lines

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
8. Pull off the control unit connector from the control unit.
9. Remove the hydraulic unit (a/f 8) and take out of the bracket, upwards.