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Difficulty: HardStopping and Braking Procedures

When bringing a manual transmission commercial motor vehicle to a normal stop, the driver should depress the clutch pedal prior to applying the service brakes to protect the drivetrain and avoid stalling the engine during deceleration.

Answer: Answer

Answer

False
The statement is false because proper commercial motor vehicle operating procedure dictates that service brakes should be applied first while the driveline remains connected to utilize engine braking. The clutch pedal should only be depressed when engine RPM drops close to idle (around 1,000 RPM) just prior to reaching a full stop.

Step-by-Step Solution

1
Analyze the mechanical effect of depressing the clutch pedal before applying the service brakes.
Disengaging the clutch separates the engine from the drive wheels, allowing the vehicle to coast freely without engine compression resistance.
Engine braking provides crucial supplementary deceleration and helps stabilize vehicle dynamics.
2
Evaluate the regulatory and safety principles of commercial vehicle stopping procedures.
Coasting with the clutch depressed reduces vehicle stability, increases reliance solely on service brakes, and can lead to increased stopping distances and premature brake fade.
Commercial driver safety standards require maximizing vehicle control throughout the entire braking phase.
3
Determine the proper sequence for clutch management during a normal stop.
The driver must apply the foot brake first to decelerate the vehicle, and only depress the clutch pedal when the engine RPM drops near idle speed (or just before coming to a complete stop).
This maintains full driveline engagement and engine braking until the final moments of the stop.

Key Concept

Powertrain Engagement and Clutch Timing During Service Braking
Estimated Time:1m 30s
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Topics

Stopping and Braking Procedures

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