operators_manual

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.
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.
Engine Compression Brake Level
Switch Operation
How to operate the compression brake.
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)
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.
Compression on\off
Compression setting
ENGINE OPERATION - Operating Instructions
18 Y53-1166-1G1 (08/2018)
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