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Open Roads Forum  >  Class A Motorhomes  >  General Topics

 > Pac Brake Question

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TominTampa

Bellevue Nebraska

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Posted: 09/05/20 05:47pm Link  |  Quote  |  Print  |  Notify Moderator

Hello All,
I’ve got a question on the Pac Brake. When we bought our 1996 Dynasty years ago, (it was used) the vehicle already had a Pac Brake installed. It’s activated by a foot pedal and when you are driving and activate the Pac Brake 2 things happen. First, the butterfly valve in the exhaust stream closes and secondly the transmission begins downshifting (as the governor allows) with a target of second gear. When parked and activating the Pac Brake the only thing that would happen would be the butterfly valve in the exhaust stream closes and so affects the engines idle. Now 10 years into owning the coach the Pac Brake has started blowing fuses. After replacing many of the components, (solenoid, relay, 36 foot wire run to the rear, etc.) I finally swallowed my pride and the took the rig to a reputable shop for trouble shooting. They got back with me 2 weeks later and told me the whole thing was wired incorrectly to start with. I paid them big money to fix it and sure enough the Pac Brake works fine now and no longer blows fuses. What’s peculiar is that it basically no longer works idling in neutral. As you recall it used to be that when parked and activating the Pac Brake the butterfly valve in the exhaust stream would close and so affect the engines idle. Now the unit only works when in gear and rolling. So, with all that said was it just a fluke that the Pac Brake worked while parked before? Should it always have been the way it is now? I don’t want to just barge back into the shop and yell, “Hey, my Pac Brake no longer works in park!”. Then have the service manager tell me that’s the way they are SUPPOSED to work. You know what I mean? Does anyone have any thoughts or advice? - Tom


1996 Monaco Dynasty 36', Cummins C8.3 with Banks Stinger kit, Allison 6 speed.


Lwiddis

Camping near Pearsonville, CA

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Posted: 09/05/20 06:19pm Link  |  Quote  |  Print  |  Notify Moderator

Your Pac Brake is 24 years old. Is it time for a full replacement and upgrade?


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Bruce Brown

Northern NY

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Posted: 09/05/20 06:48pm Link  |  Quote  |  Print  |  Notify Moderator

Just me, I've never know one to work as you originally described. The way it works now is how I've always known them to work.


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MrWizard

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Posted: 09/05/20 10:33pm Link  |  Quote  |  Print  |  Notify Moderator

This
It worked in park because it was missed wired
No reason for it to engage in park


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Flute Man

Payson, Arizona

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Posted: 09/05/20 10:49pm Link  |  Quote  |  Print  |  Notify Moderator

It’s working now the way it should. Never heard of one working in park.


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TominTampa

Bellevue Nebraska

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Posted: 09/06/20 08:19am Link  |  Quote  |  Print  |  Notify Moderator

Thanks folks, that gives me some peace of mind that the money I paid was worth it. I really appreciate the responses! - Tom

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Posted: 09/06/20 12:47pm Link  |  Quote  |  Print  |  Notify Moderator

Tom, did they upgrade the brake when they reinstalled it? If it's original equipment it's inadequate. On my 96 I changed to the PRXB and what a difference it made. You might consider that. Wasn't too expensive and took me 20 minutes in a campground. Oh! and mine only worked when going down the road, never parked.....Dennis


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TomandCandy

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Posted: 09/06/20 07:54pm Link  |  Quote  |  Print  |  Notify Moderator

I also have a 1996 diesel coach that has a pac brake mine is either on or off from a switch and you can tell when idling if its on or not however mine is not connected to the transmission I have to manually shift the transmission for hills not a big deal I had it installed about 15 years ago still works good

TominTampa

Bellevue Nebraska

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Posted: 09/06/20 09:16pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks Dennis, I'll have to do some digging on that and find out.

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