Pacbrake compressor won't shut off...

[mconstable]

First, thanks for all of the previous advice... I have sort of an emergency question... I just finished re-wiring the new air tank and compressor for my Pacbrake... question is:
When I turn the key on, the compressor kicks on to fill the tank with the Pacbrake switch in the off position... is this correct?
Or do I have the main wire to the solenoid relay and compressor relay reversed?
Thanks!

 

[AH64ID]

Are there 2 switches for the compressor/brake? If not then I would assume its normal, you need air to run the brake and the 1 switch is for the brake.

But, if it is wired backwords does it shut-off if you turn the switch off?

 

[DZinger]

Mine has one switch and it only turns the brake on and off. The compressor runs independent of that switch (has a pressure switch that controls it) to ensure you have adequate air when the brake is turned on.

 

[SBashaw]

DZinger is right, that is how you wire it using the kit supplied. I opted for a second switch to run just the compressor. I also installed an LED light to let me know when the compressor is running. That way if the compressor runs for extended periods of time , I know I have a major leak in the system. and wont burn up my compressor

 

[mconstable]

Thanks guys... I've got something haywire... pressure switch isn't shutting the compressor off, guess I'll tear into it after the weekend.

 

[Troubleshooter]

I just went through this same problem of the compressor not shutting off. Fortunately, I had a separate on/off switch just for the compressor, like DZinger does. The factory compressor has a pressure switch that should shut off the compressor when the tank reaches 130psi, and turns the compressor back on when pressure in the tank hits 110psi. That gave me a place to start troubleshooting the system.



In my case it turned out to be a combination of two problems: the brass fitting on one of the lines had come loose, allowing an air leak. And the pressure relief valve on the reservoir tank needed cleaning. Apparently a bit of gunk must have gotten in there, so it was releasing pressure from the tank before hitting the 130psi threshold.



Get yourself a spray bottle with some soapy water and start looking for leaks!