Exhaust Brake Operation
- Before starting the engine, make sure that the exhaust brake is off. Wait until the engine has reached normal operating temperature before activating the exhaust brake.
- When approaching a downhill grade, press the upper half of the exhaust brake switch to turn the exhaust brake on. When the exhaust brake is on, the status bar is illuminated.
- Remove your feet from the accelerator and clutch pedals.
- While going down a grade, use a low enough gear to safely
descend with a minimum application of the service brakes. As a general
guideline, use the same gear as you would to ascend the hill.
The following conditions should exist if the brake is operating properly:
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A slight change in the sound of the engine may be noticeable.
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Exhaust smoke should appear normal.
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Engine temperature should remain in the normal operating range.
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Road speed will usually decrease when the exhaust brake is applied during a descent. When the vehicle is carrying a heavy load or the grade is extremely steep, you may need to apply the service brakes occasionally.
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The exhaust brake retards the vehicle with a smooth braking effect.
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During a descent, the tachometer usually shows a drop in rpm, depending on the grade and the vehicle load.
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Depending on the grade and vehicle load, the retarding force of the exhaust brake may be noticeable.
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- Apply the service brakes to reduce engine rpm or make a slower descent by using a lower gear.
- Make sure the exhaust brake is turned off before shutting down the engine.
Warning: Do not use the exhaust brake when driving on slippery or low-traction road surfaces. Failure to follow this precaution could result in a loss of vehicle control and possible personal injury or property damage.
Notice: The exhaust brake is only active when engine speed is between 1100 and 2700 rpm.
Note: Do not allow the engine to exceed its governed speed, or serious engine damage could result.