Paccar PX 8 Operator's Manual - page 40
Operating Instructions
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Y53-1030A 12/09
PACCAR
The clutch switch uses the motion of the clutch linkage to
deactivate the engine brakes when the clutch pedal is
depressed.
The service brake pressure switch is attached to the service
brake air supply line.
Applying the service brakes while in cruise control will
disengage the cruise control and enable the engine brakes.
If the pedal-activated engine brake feature is enabled, the
service brake pedal must be depressed (tapped) before the
engine brakes will be activated.
CAUTION: Do not operate the engine brake until
the engine oil temperature is above 30°C [86°F].
Operation below 30°C [86°F] could cause severe
damage to the engine. Idle the engine 3 to 5 min-
utes at approximately 1000 rpm to warm the
engine before activating the engine brakes.