A tractor-trailer is descending a slippery downgrade with the engine retarder active when the drive wheels suddenly lose traction and begin to slide sideways. Which action should the driver take immediately to regain directional control?
- ASteer firmly in the opposite direction of the rear slide while applying the trailer hand valve to pull the combination straight.
- Turn off the engine retarder immediately, stay off the brakes, and steer in the direction the vehicle needs to go.Cevap
- CKeep the retarder engaged to preserve engine braking force and apply firm, continuous pressure to the service brakes.
- DLock the service brakes fully and counter-steer toward the high side of the road slope.
Cevap
Turn off the engine retarder immediately, stay off the brakes, and steer in the direction the vehicle needs to go.
When drive wheels skid on a slippery road due to retarder torque, the first essential step is to switch off the retarder and stay off the brakes so the wheels can regain rotational grip. The driver must then steer in the direction the vehicle needs to go and counter-steer as the vehicle straightens to prevent a secondary slide.
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Drive-wheel skid recovery and retarder safety on slippery surfaces
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