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Difficulty: HardStopping and Braking Procedures

When bringing a commercial motor vehicle equipped with a manual transmission to a normal stop from highway speed, the driver should depress the clutch pedal simultaneously with the initial service brake application to reduce driveline wear and prevent engine stalling.

Answer: Answer

Answer

False. The clutch pedal should remain engaged during initial braking and should only be depressed when the engine speed drops near idle just before the vehicle completely stops.
The statement is false because proper commercial driving procedure requires keeping the clutch engaged during initial and intermediate braking. This utilizes engine compression braking to assist deceleration and maintain driveline stability. The clutch pedal should only be depressed when the vehicle has slowed to near idle speed right before stopping.

Step-by-Step Solution

1
Analyze the mechanical effect of depressing the clutch pedal during initial deceleration.
Disengaging the clutch separates the engine from the drive axle, putting the vehicle into a freewheeling (coasting) condition and eliminating supplemental engine braking.
Engine compression assists foundation brakes in slowing a heavy vehicle safely and efficiently.
2
Evaluate standard CDL stopping and braking operational procedures for manual transmissions.
Standard procedure dictates applying the foot brake smoothly and keeping the clutch pedal up until the vehicle has slowed substantially.
Maintaining driveline connection maximizes vehicle control, minimizes foundation brake heating, and prevents premature brake fade.
3
Determine the exact threshold for clutch depression prior to a full stop.
The clutch is depressed only when engine RPM falls near idle (typically within a few feet of stopping).
This timing prevents the engine from stalling while ensuring full engine braking benefits throughout deceleration.

Key Concept

Manual Transmission Stopping and Clutch Disengagement Timing
Estimated Time:1m 0s
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Topics

Stopping and Braking Procedures

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