Engines 4. When either the clutch or throttle pedal is de- pressed, the engine brake is deactivated. WARNING Don’t use the engine brake as a primary braking system when the service brakes are operable. This can cause long, unpredictable stopping distances, possibly resulting in personal injury or property damage. CAUTION If the engine brake fails to shut off when either the throttle or clutch pedal is depressed, place the dash switch in the OFF position and do not use the en- gine brake until the throttle or clutch switch system is repaired.
If the engine brake fails to shut off when the dash switch is turned off, the engine should be shut down and the engine brake repaired before continuing operation. Failure to do so could result in damage to the engine. Whenever vehicle braking is required, the engine brake may be used with the service brakes. There is no time limit for operation of the engine brake. 1. After the engine is warmed up and the vehicle is in motion, move the paddle switch to the desired posi- tion, LO or HI. Depending on the engine model, LO will provide 1/3 or 1/2 of the full braking capacity of the engine. HI will provide maximum engine brak- ing. Exhaust Braking System, Optional General Information 2.
The engine brake activates when the dash switch is in LO or HI position and the driver’s feet are re- moved from both the clutch and throttle pedals. If the engine brake fails to activate, stop the vehicle in a safe spot and check the adjustment of the throttle and clutch switches. If no cause can be de- tected in the electrical system, check the engine brake system. An exhaust brake is an optional auxiliary braking sys- tem that assists but does not replace the service brake system.
The exhaust brake switch located on the con- trol panel, in combination with the accelerator and clutch pedals, allows the driver to make maximum use of the exhaust brake in off-highway and mountain driv- ing as well as in traffic or high speed highway driving. 3. To obtain maximum retarding, maintain the top gov- erned speed of the engine through appropriate se- lection of gears when the engine brake is in use. 4.29