An operating permit is available for the brake system of the vehicles. This licensing becomes invalid if the brake system is modified. Therefore, modifications of the brake system are illegal.

If it cannot be avoided to perform works on the brake system, e. g. changing the wheel base, the following instructions are to be considered:

• Replace hydraulic brake lines completely.
• Dimensions of roller laminated tube: 4.75 x 0.7; plastic lines/tubes are not permitted.
• Mould lines only with a bending fixture
• Bend radius = 17.5 mm
• Clean the interior of lines.
• Keep safety clearance to heat sources, pointed, sharp or moving parts
• Attachment with plastic loops, max. distance 500 mm
• Let the ALB controller be re-adjusted by a VW dealer if the weight has changed.

After finishing works, check whether the brake system is perfectly functioning.

• If a retarder is to be subsequently installed at the transmission or in the drive-shaft strand, it is required to ask the responsible department for a permission. Approvals are not generally given but are basically limited to specific vehicle designs and wheel bases.

The mounting drawings must include the following information:

• Position of the retarder in the vehicle
• Drive-shaft angle
• Length of the drive shafts
• Due to the additional weight of the retarder, the distribution of weight and adherence of the permitted axle loads has to be checked. Check location of the centre of mass of the attachment. Adjust it, if required.
• Mounting is only permitted at vehicles with sufficiently dimensioned electrical installation (generators and batteries with sufficient capacity). Ensure a sufficient ground connection of the retarder.
• Ensure sufficient freedom of operation.
• In the drive-shaft strand, attach the retarder only at the bar of the chassis frame using brackets with silent blocks.
• Protect lines against heat by using an appropriate insulation. The permitted maximum temperature for polyamide lines is 80°C.