Operating Instructions
PACCAR Y53-1030A 12/09 – 31 –
Compression Brake System
The amount of braking power available in a given engine
series varies. Braking power depends on turbocharger boost
pressure, engine speed, compression ratio, injector timing,
and when the engine brakes open the exhaust valves.
Engine brake controls, with the fuel system, consists of the
following:
• A two-position selector switch standard (three-position
selector optional) .
• An on/off switch.
• A clutch switch.
• A throttle sensor.
With the ON/OFF switch in the ON position, the brake
automatically creates its braking effect when you remove
your foot from the accelerator pedal.
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