120 STARTING AND OPERATING WARNING! DIESEL EXHAUST BRAKE (ENGINE BRAKING) Never leave children alone in a vehicle, or with access to an unlocked vehicle. Leaving unat tended children in a vehicle is dangerous for a number of reasons. A child or others could be seriously or fatally injured. The purpose of the exhaust brake (engine braking) feature is to supply negative (braking) torque from the engine. Typically, the engine braking is used for, but not limited to, vehicle towing applications where vehicle braking can be achieved by the internal engine power, thereby sparing the mechanical brakes of the vehicle.
Do not leave the key fob in or near the vehicle, or in a location accessible to children, and do not leave a vehicle equipped with Keyless Enter ‘n Go™ in the ACC or ON/RUN position. A child could operate power windows, other controls, or move the vehicle. Benefits of the exhaust brake are: Exhaust Brake Switch Vehicle driving control. Once the Exhaust Brake Indicator is illuminated and the vehicle is moving faster than 5mph (8km/h); the exhaust brake will automatically operate when the driver removes pressure from the accelerator pedal. Exhaust braking is most effective when the engine RPM is higher.
The automatic transmission will downshift more aggressively in TOW/HAUL mode when the exhaust brake is enabled to increase brake performance. Be sure the parking brake is fully disengaged before driving; failure to do so can lead to brake failure and a collision. Reduced brake fade. Longer brake life. Faster cab warm-up. The exhaust brake feature will only function when the driver toggles it on by pushing the exhaust brake button until the Exhaust Brake Indicator is illuminated. Normal (Full Strength) exhaust brake mode is indicated by a yellow Exhaust Brake Indicator. Always fully apply the parking brake when leaving your vehicle or it may roll and cause damage or injury.
Also, be certain to leave the transmission in PARK. Failure to do so may cause the vehicle to roll and cause damage or injury. Do not use the exhaust brake feature when driving in icy or slippery conditions as the increased engine braking can cause the rear wheels to slide and the vehicle to swing around with the possible loss of vehicle control, which may cause an accident possibly resulting in personal injury or death. WARNING! CAUTION! If the Brake System Warning Light remains on with the parking brake released, a brake system malfunction is indicated. Have the brake system serviced by an authorized dealer immediately.