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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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Hi all I am new have pb on my manual 2003 3500, my brake will work then just stop , I hit a bump and it works again , the switch will not activate the brake , then it will mysteriously start working again , I see checking acceleration switch? When I let my foot off it will not work , but if I pound the brake pedal it sometimes activated the brake , I live this brake , but need a little help figuring it out, thank you
 
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