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Difficulty: MediumAccelerating Methods

When operating a manual transmission commercial motor vehicle stopped facing uphill on an incline, which action should the driver take to safely prevent the vehicle from rolling backward before accelerating?

  1. A
    Activate the auxiliary engine retarder to hold the drive axles stationary prior to releasing the service brake pedal.
  2. B
    Rapidly cycle the clutch in and out while in neutral to build hydraulic line pressure before selecting a forward gear.
  3. Partly engage the clutch before taking the foot off the brake pedal, or use the parking brake until sufficient engine power is applied.Answer
  4. D
    Release the service brake completely and apply full throttle abruptly to spin the drive tires into immediate forward motion.

Answer

Partly engage the clutch before taking the foot off the brake pedal, or use the parking brake until sufficient engine power is applied.
According to standard commercial driving basic vehicle control procedures, rollback must be stopped before starting forward movement. On manual transmission commercial vehicles, the operator should partly engage the clutch to the friction point before releasing the foot brake, or apply the parking brake and only release it once sufficient engine power is developed to hold and move the vehicle forward smoothly.

Step-by-Step Solution

1
Maintain firm pressure on the service brake pedal or set the parking brake while the commercial motor vehicle is stopped on an incline.
The vehicle remains completely stationary and is prevented from rolling backward into traffic behind.
Commercial motor vehicles must never be allowed to roll backward when starting on a grade.
2
Select the appropriate low starting gear and partly engage the clutch to the friction point before releasing the brake pedal, or hold the parking brake until throttle delivers enough torque.
Engine power balances gravitational pull before brake pressure is fully removed.
Ensures smooth forward power delivery without rollback, wheel spin, or drivetrain shock.

Key Concept

Incline Launching and Rollback Prevention
Estimated Time:1m 0s
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Accelerating Methods

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