A commercial motor vehicle driver operating a vehicle without an Anti-lock Braking System (ABS) encounters an obstruction ahead and must perform an emergency stop using the controlled braking method. In what chronological sequence should the driver execute this braking procedure to stop safely while preserving directional control?
- 1Apply the service brakes as firmly as possible without causing the wheels to lock up.
- 2Make only minor steering adjustments as necessary to keep the vehicle tracking straight in its lane.
- 3Release the brake pedal immediately if the wheels lock and the vehicle begins to slide or lose steering.
- 4Reapply firm brake pressure once the tires resume rolling to finish stopping the vehicle.
Answer
The correct sequence begins by applying the service brakes firmly without locking the wheels, making minor steering corrections while tires roll, releasing the brake pedal if wheel lockup occurs, and finally reapplying firm braking pressure as soon as the wheels resume rolling.
Controlled braking is an emergency stopping technique where the driver applies the brakes as hard as possible without locking the wheels. Rolling tires provide the lateral grip needed to make minor steering corrections to keep the vehicle in its lane. If the wheels inadvertently lock up, the driver must instantly release the brake pedal so the wheels can resume rolling, after which firm brake pressure is reapplied to finish stopping.
Step-by-Step Solution
Key Concept
Controlled braking procedure for emergency stopping without ABS
Estimated Time:1m 15s