The brake test should be performed on a single-axle roller dynamometer with contra-rotating rollers for four-wheel drive vehicles. |
Contra-rotating means that the dynamometer rollers are driven forwards on one side and backwards on the opposite side. |
This prevents brake forces being transferred to the drive train. |
The forward rotating wheel is measured during the test, which means two brake tests per axle must be performed. |
The maximum test speed must not exceed 6 km/h. |
The test rigs authorised by Volkswagen fulfil these requirements. |
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