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 PRXB Exhaust Brakes: Controllers How the Pacbrake Controller works… Upon turning on the vehicle’s ignition, a 12 VDC signal is sent to the Pacbrake Control unit. With the Pacbrake switch in the ON position, a signal can be confirmed by the illuminated light in the switch. The switch can be located either in the dash or on the shift lever of standard transmission vehicles.
Once the controller receives ignition power, it then checks for a ground source through the pressure switch (located on the air tank). If a ground is achieved and the air tank pressure is below 110 PSI, the controller will activate the air compressor. The air compressor cycles to fill the air tank until it reaches full capacity, which then opens the pressure switch and turns off the air compressor. This signals the controller to cycle the exhaust brake 2 - 3 times (anti-foul cycle). * This anti-foul cycle will only happen if the ON/OFF switch is in the OFF position.
At all times, when activated, the controller reads the vehicle parameters such as vehicle speed, engine RPM, throttle position, cruise on or off… etc. When all vehicle parameters are met, and the Pacbrake switch is on, the controller then supplies power to the exhaust brake control solenoid. The solenoid opens, allowing air from the tank to supply and activate the air cylinder on the exhaust brake. The air cylinder then closes the butterfly valve located inside the exhaust brake housing, activating retarding. At any time, if the vehicle parameters are not met, the exhaust brake will disengage.
Note: For automatic transmission vehicles only, the controller will also control the lock-up of the torque converter.  
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