Checks Notes on fourwheel drive

Balancing the wheels on the vehicle

All four wheels must be off the ground and able to spin freely when the wheels are precision balanced on the vehicle.

Performance tests

Performance tests must only be run on 4-roller dynamometers with rpm coupling. When running tests on 2-roller dynamometers, interrupt the connection between front and rear axle at the central shaft.

Brake tests

Brake tests must only be run on roller dynamometers or plate dynamometers. If no four-wheel drive brake dynamometer (rol ler dynamometer) is available, make sure the below limits are not exceeded on conventional roller dynamometers:

Test speed 5 mph

Test duration 20 seconds

Towing

If the vehicle has to be towed with the front or rear axle off the ground, the wheels of the raised axle must be able to rotate freely.

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