General information
ATTENTION: If possible, use a roller stand to check the braking forces of all four wheels at the same time.
The front and rear wheels cannot be independently driven due to the limited friction clutch. The presence of this clutch eliminates the need for a center differential lock mechanism, since when the front wheels slip, most of the torque goes to the rear wheels.
DO NOT attempt to drive one axle while the vehicle is on a jack or lift.
Stand for simultaneous testing of the braking forces of all four wheels
Ensure that the front and rear pairs of rollers rotate at the same speed, ensure that the established safety regulations are observed. During the test, there are no restrictions on wheel speed, except for the restriction imposed by the maximum permissible speed of the tires.
Before testing on a roller stand for all wheels of a car with an ABS system, it is necessary to disable the ABS modulator. The ABS system will not function and the ABS warning light will come on. This will enable normal braking.
Stand for simultaneous testing of the braking forces of the wheels of one axle
The ABS system will not work on a single axle roller stand. The ABS warning light will illuminate during testing. This will enable normal braking.
If the braking forces are determined on the stand for simultaneous testing of the braking forces of the wheels of one axle, then the following precautions must be taken:
- the cardan shaft to the rear wheels is dismantled or disconnected;
- installed in automatic transmission "neutral";
- downhill forced deceleration mode is not enabled.
During the brake force test, the engine must be idling to provide the vacuum necessary for the operation of the vacuum booster.
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