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Old 08-12-2014, 09:42 PM   #1
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PAC Brake not Activating

When I take my foot off the throttle I get no downshift & no brake activation. I have checked the fuse for the PAC Brake. If I energize the solenoid with 12v the air cylinder does close the exaust butterfly. Any ideas?
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Old 08-12-2014, 11:09 PM   #2
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Try turning off the cruise control. The truck I drive with a Cat C12, will not let the Jake work with the cruise on. I know it is different than a pac brake but worth a try. My coach with a ISC Cummins will sometimes do the same thing.
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Old 08-12-2014, 11:19 PM   #3
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Could be a communication problem or a relay .
System wants to see , zero throttle signal from the TPS, so binding pedal due to carpet ; or as was my case rusted hinge. Others have reported switch trouble , not passing power to the system even though the light is on. With the no downshift displayed I'd, look at the switch. If the trans control showed 2 and no activation I'd think relay.
You would need a wiring schematic for your coach to track down a relay , if in fact it has one , but most do.
My coach has 2 relays for exhaust brake and I don't know why , and hope I never have to find out.
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