 Note
| The brake test must be performed on a controlled
contra-rotating single-axle roller dynamometer for four-wheel
drive vehicles. |
| “Contra-rotating” means that the dynamometer rollers of the
single-axle roller dynamometer are driven forwards on one side
and backwards on the opposite side. |
| The rollers drive the wheels of one axle in opposite
directions to avoid transmitting torque to the other axle. |
| “Regulated” means that the speed of the brake test stand
rollers is so controlled so that there is no difference in speed
during the brake test. |
| This prevents the transfer of a force through the stationary
wheels (not on the set of rollers) via the propshaft to the
rotating wheels on the rollers. |
| 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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Questions & answers
On a regulated roller dynamometer with contra-rotating rollers for four-wheel drive vehicles — Volkswagen Golf Mk7
How do I test Golf Mk7 4WD brakes on a roller dynamometer?
Use contra-rotating rollers to prevent the 4WD system from binding. Follow the dynamometer manufacturer's procedure for 4WD vehicles.
The drive is provided by the test rig.
For vehicles with a manual gearbox, ensure that the gear
lever is in neutral for the test. F ...
Note
If no test rig is available for four-wheel drive vehicles,
the brake test can also be carried out on a standard single-axle
roller dynamometer as ...
