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I had a pac brake installed on my 03 7.3 auto transmission, installers cannot get brake to engage when driving, compressor runs, with key on switch turned on and lights up, you can here valve go through its check sequence, but when you drive nothing happens, have a red light on switch never turns orange and no sound or evidence the valve closed. Its Friday night and we are headed out supposedly Sunday, any thoughts ideas would be appreciated, thanks
 

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It’s a micro switch bolted to the side of the accelerator pedal that activates when completely off the throttle. Disconnect the wires and test for continuity when the switch should be closed. I sometimes skip my foot off the pedal to slap the switch into activation.
 
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