A3 Mk1
Brake test
Four-wheel drive vehicles (Haldex coupling)
Brake test on single-axle dynamometer for four-wheel drive vehicles The dynamometer drives the wheels of one axle in opposite directions to avoid the other axle being driven. We recommend use of a brake dynamometer with controlled roller speed and a max. test speed of 6 km/h. Failure to comply with the above specifications can lead to brake application (EDL control). In such cases switch off engine and ignition for test purposes. Run engine briefly if necessary to build up sufficient vacuum for brake test. If no four-wheel drive dynamometer is available, testing can also be performed using a conventional dynamometer.
Engine must not run and ignition must not be switched on during test, as otherwise rear axle would be driven by Haldex coupling. |