An operating permit has been granted for the vehicle braking system. This permit becomes void if any changes to the braking system are made. Changes to the braking system are therefore not permissible.

If wheelbase modifications result in a necessity to work on the braking system, the following points must be observed:

• Renew hydraulic brake lines completely
• Coil pipe dimension 4.75 x 0.7, synthetic lines not permissible
• Shape lines only in a bending device
• Bend radius 17.5 mm
• Clean lines from inside
• Maintain safe distance from heat sources, sharp and moving parts
• Attach with plastic loops, max. spacing 500 mm
• Have ALB regulator readjusted in VW workshop if weight is altered.

On completion of work measures, check braking system works correctly.

RetarderPreparation for installation of a retarder can be ordered ex-factory (PR no. 1H5). This special equipment option comprises of:

• Adapted cross member structure on underbody
• Wiring to beneath the vehicle
• Wiring of service switch, warning lamp and hand switch in cockpit.

The service switch and the hand switch are read by a parametering special module (PSM). The PSM transmits the signals to the interface under the vehicle to allow communication with the retarder control unit.

The warning lamp is actuated directly by the retarder.
For power supply to the retarder there is a terminal 30 connection on the underbody.

Any remaining wiring required under the vehicle, from the control unit to the retarder, and positioning of the components must be carried out by the custom body manufacturer/coachbuilder.

Retroactive installation of a retarder is only permissible on vehicles with PSM.
Install only in vehicles with sufficiently configured electrical system (alternator and batteries with sufficient capacity). Ensure the earth connection of the retarder is sufficient.

Due to the excess weight of the retarder, check weight distribution and adherence to permissible axle loads.

Ensure sufficient strength and stability.

Drive shafts

• For wheelbase modifications, drive shaft allocation and drive shaft lengths must be configured as per comparable series production vehicles.
• The drive shaft tube must be the same in diameter and material thickness as the series production vehicle.
• If necessary, couple several drive shafts together with intermediate bearings.
• The flange surfaces must be completely flat.
• The bend angle (ß1 = ß2) must not exceed a value of 6°. Deviations impair the service life and noise emissions.
• Balance drive shafts before installation.
• Volkswagen AG is not in a position to comment on road holding, braking and steering characteristics where extreme wheelbase modifications have been made.