A commercial driver is operating a tractor-trailer without an Antilock Braking System (ABS) on a dry, straight highway when an obstacle suddenly blocks the lane. The driver must perform emergency controlled braking to stop in the shortest distance while maintaining steering control. Which procedure correctly describes how the driver should execute controlled braking in this situation?
- AApply the brakes fully until the wheels lock up, release the pedal completely when the vehicle begins to slide, and reapply maximum pressure once the wheels roll again.
- Apply the brakes as hard as possible without locking the wheels, keep steering adjustments very small, and release the brakes slightly if the wheels lock up before reapplying.Cevap
- CEngage the engine retarder to maximum setting and apply light, steady service brake pressure to allow drivetrain resistance to stop the vehicle without tire lockup.
- DBrake firmly until road speed drops by 5 mph, release the brake pedal completely for several seconds to dissipate drum heat, and repeat in cycles until fully stopped.
Cevap
Apply the brakes as hard as possible without locking the wheels, keep steering adjustments very small, and release the brakes slightly if the wheels lock up before reapplying.
Controlled braking is executed by applying the service brakes as hard as possible without locking the wheels. If the wheels begin to lock up or if steering corrections become necessary, the driver slightly releases the brake pressure until rolling traction is restored, then reapplies pressure. This technique achieves the shortest possible stopping distance while keeping the vehicle steerable.
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Anahtar Kavram
Controlled Braking Technique
Tahmini Süre:1m 30s