Mack CHM 2010, Руководство оператора

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102 OPERATION
How the Engine Brake is Activated
When the engine brake is "enabled" (switch in either LOW or HIGH position), your engine
V-MAC® electronic control system commands engine brake power (engine brake "active")
only when the following conditions are true:
•
The foot-operated engine accelerator pedal is not depressed.
•
The clutch pedal is not depressed (manual shift transmissions only).
•
The engine speed is at least 900 rpm.
If the engine brake is active, the engine brake will automatically be deactivated by
depressing either the accelerator or the clutch, or if the engine speed drops below 900 rpm.
As soon as all of the engine brake "active" conditions are again true (taking your foot off the
accelerator, for example), the engine brake will again be activated. In order to disable the
engine brake, simply return the dash-mounted control switch to the OFF position.
DANGER
The engine brake should never be considered a substitute for the vehicle service brakes.
The service brakes should always be maintained in good working order, and should
always be viewed as the primary vehicle slowing system. Service brakes are always
used to bring the vehicle to a complete stop.