Installing Wire Harness For Brake Booster

1. 1.1. Push wire harness for brake booster through from the engine compartment towards the interior -arrow A-  and fit rubber sleeve on the centre firewall.
2. 1.2. Clip in wire harness for brake booster on the centre firewall with the retaining clip -arrow B-  .
   Fig 2: Fitting Rubber Sleeve

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1. 2.1. Insert wire harness into the two holders -arrows A-  and close the holders -arrows B-  .
2. 2.2. Insert line into the two retaining clips -arrows C-  and close the retaining clips -arrows D-  .
   Fig 3: Securing Wire Harness On Centre Firewall

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Fig 4: Plugging In Pressure Sensor Connector (Brake Assist)

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1. 3.1. Plug in connector on pressure sensor (brake assist system) -arrow-  until it engages securely.

Fig 5: Plugging In Connector On Way-Sensor (Brake Assist)

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1. 4.1. Plug in connector on way-sensor (brake assist) -arrow-  until it engages securely.

Fig 6: Plugging In Connector On Brake Booster

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1. 5.1. Plug in connector on brake booster -arrow-  until it engages securely.

Fig 7: Plugging In Connector On Brake Fluid Reservoir

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1. 6.1. Plug in connector on brake fluid reservoir -arrow-  until it engages securely.

Fig 8: Securing Ground Strap On Centre Firewall

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1. 7.1. Clip in wire harness on the firewall with the retaining clip -arrow A-  .
2. 7.2. Connect ground strap together with the twist lock to the threaded bolt on the centre firewall -arrow B-  and secure with fastening nut. → Tightening torque: 9 Nm (6.5 ftlb.) 

Information 

Select a place for the joint where there is enough space to join all the lines present.

Do not cut the lines too short in case they have to be laid in a different position if there is insufficient space in the area of the joint.

Information 

The electric lines are located in the plenum panel and are thus exposed to the highest demands.

The greatest care must be used in the individual work steps for stripping insulation from, crimping, and shrinking/insulating the electric lines.

The procedure for stripping insulation from, crimping, and shrinking/insulating the electric lines must be complied with and observed. The procedures are described in detail in the Repair kit for Cayenne harnesses NR.155-2. 

Crimping samples are to be prepared before beginning work.

Fig 9: Connecting And Routing Wire Harness For Brake Booster

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1. 8.1. Cut off lines in different lengths (due to the shrink-fit connections).
2. 8.2. Slide shrink-fit hoses onto the lines.
3. 8.3. Strip 10 mm of insulation off the lines.
4. 8.4. Crimp the lines using crimping sleeves and the manual crimping pliers  from the repair kit for Cayenne wire harnesses Nr.155-2. 
5. 8.5. Slide the shrink-fit hoses over the crimp connections and carefully shrink them using the hot-air blower with special nozzle  (recommended accessories for the repair kit for wire harnesses) so that they are watertight.
6. 8.6. Wrap commercially available PVC tape all around the area of the connection points.