ENGINE OPERATION - Operating Instructions 1 progressively stronger braking to slow the vehicle down. Engine compression brake controls include: ON/OFF switch Three-position selector switch Clutch switch Throttle sensor Service brake pressure switch Eaton Vorad® Anti-Lock Braking System Engaging conditions for the engine compression brake: Engine speed must be above 1,000 RPM. Coolant temperature must be above 59°F (15°C). Deactivation conditions for the engine compression brake: Accelerator pedal is depressed. Clutch pedal is depressed. Engine speed falls below 800 RPM. ABS control is active. ECM recognizes a system problem. position there will be 33 percent engine braking.
With the compression brake switch ON, the compression brake will be engaged when the service brake is applied. If the cruise control is operated in conjunction with the compression brake, the compression brake will engage to maintain the cruise set speed. CAUTION Operating the engine with a compres- sion brake that will not automatically deactivate (i.e. when the dash switch is OFF, clutch pedal is depressed or throttle is applied) will cause severe in- ternal engine damage. Do not operate the engine if the compression brake will not deactivate. Failure to comply may result in equipment or property damage.
Compression on\off Engine Compression Brake Level Switch Operation How to operate the compression brake. Compression setting There are two switches that control your vehicle’s engine compression brake. One switch turns the system ON/OFF and the second switch controls the braking level. These switches are located on the dash switch panel. For the three-position engine compression brake level switch, there will be 100 percent engine braking when the switch is in the up (HIGH) position. In the middle (MEDIUM) position, there will be 66 percent engine braking. In the down (LOW) 18 Y53-1166-1G1 (08/2018)