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Topic: PAC Brake Frozen (Read 2264 times) previous topic - next topic

Re: PAC Brake Frozen

Reply #25 –
Woody,

It's fun figuring out these electrical puzzles...right?  (Keep telling yourself that)

I know your PAC system is different from my US Gear exhaust brake, but hoping there is some similarity that might help you.  Does your throttle pedal have any kind of wire attached to it?  Mine has a wire connected to the top right corner.  If you look closely (photo below), you can just see the tab where the flat "push-on" wire connector is attached.  The pedal has some kind of pressure sensor on it, which is part of my exhaust brake installation.  If I have the brake turned on and apply any throttle, the brake turns off.  If you don't have this wire on your gas pedal, I'm wondering how your brake would "know" when you step on the throttle.  Some kind of sensor on the throttle linkage at the engine?

If you are that close to the Pacbrake head office, I would see if they can provide the installation paperwork for your model brake.  Might answer a lot of your questions.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: PAC Brake Frozen

Reply #26 –
I did a run down the road and as Wolfe10 suggested I turned the switch on/off/on while in 3rd and 4th gear at higher revs going downhill.  The Pacbrake works - however it seems that it also 'works' going uphill when the switch is on and the same gear/revs combination is at play.  Therefore the connections as they now stand are for manual operation only.  I am happy to get this far and will sort out the switching/wiring that is needed for the Pacbrake system to 'know' when accelerator is pressed.
I am sneaking up on a full solution and learning several things as I do it.  I remain optimistic.
Woody & Sandy Lloyd
1993 Grand Villa
Unihome U280
Cummins / Allison
Build # 4379

Re: PAC Brake Frozen

Reply #27 –
Maybe manually engaging of the exhaust brake would be a simpler solution. Unless you like this sort of challenge. BTW this isn't Woody, a former bluebird owner by chance?
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: PAC Brake Frozen

Reply #28 –
Quote from: Old phart phred –
BTW this isn't Woody, a former bluebird owner by chance?

If the same Woody you are referring to, he is still in a Bluebird 2003 LX, full timing, and still in the USAR.
Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: PAC Brake Frozen

Reply #29 –
The PAC brake on my 330 Cat appeared to be frozen.. The micro switch in the floor switch had lost contact. Replaced micro switch ..problem  solved.....
2001 U320 40ft
Build #5867
2003 Tracker
VE7DOD

Re: PAC Brake Frozen

Reply #30 –
Update: Replaced the PacBrake mechanism and it all works great. Had replaced it 9 months ago and it works great on downhill and stopping when getting off the highway. Holds the RV steady in 4th gear when going down those long 6% downgrades without brakes. Glad I replaced it.
AKA Chuck
1993 U280 40' WTB, Build 4345, CUM 8.3 "Falcor", 2010 Honda CRV TOAD (Spock), 970W solar on roof
Full-Time traveler between Quartzsite AZ, Longview WA, Ellendale ND, and Lake City SD
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