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Old 02-25-2013, 11:03 AM   #1
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Newbie with a Pac Brake

Just bought my first diesel pusher and not sure if the pac brake works. When used it seems to slow a little, but very little. When the pac brake is ingaged shouldn't you here it? Coach sat for a little over a year with no use. 1996 Monaco Dinasty 8.3 Cummins 34'.

Thanks,
Mike
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Old 02-25-2013, 05:00 PM   #2
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Yes, you should hear it. Turn on your rear camera monitor audio. You should hear it (and I quote) pplllllttttttttttttttttttttttttttttttttttt. Okay, maybe bad re-enactment, but you can hear it thru the rear monitor.

You should also be able to feel the exhaust brake engaging. If you're on level ground, you should feel the drag. If not, it's not working properly.
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Old 02-26-2013, 07:39 AM   #3
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Don, thanks. I'm taking it in to have it serviced and will have them check the Pacbrake.
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Old 03-03-2013, 12:58 PM   #4
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If you have a Jacobs engine brake you can hear it. If you have a exhaust brake you will not.

When you engage the brake the selected gear number on your transmission should change from 6 to 2.

Jim
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Old 03-03-2013, 01:10 PM   #5
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Jim, I can hear my exhaust brake hissing when it is on with my small drivers window open, really can hear it if along side of something, concrete barriers, buldings etc.
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Old 03-03-2013, 03:02 PM   #6
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I can hear my exhaust brake thru the rear monitor audio. It definitely hisses when engaged. Just sitting in the driver's seat w/ audio off, not so much.
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Old 03-03-2013, 03:10 PM   #7
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Quote:
Originally Posted by Solar 33 View Post
Just bought my first diesel pusher and not sure if the pac brake works. When used it seems to slow a little, but very little. When the pac brake is ingaged shouldn't you here it? Coach sat for a little over a year with no use. 1996 Monaco Dinasty 8.3 Cummins 34'.

Thanks,
Mike
When coasting with the pac brake turned on does the trans shifter indicate that the transmisson is going to select a lower gear?
How fast are you going when you test the pac brake ?
How many RPM ? Pac brake works best above 2000 RPM, and when using mine , if the RPM drops below 2000 the trans shift down a gear.
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Old 03-04-2013, 10:34 AM   #8
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I have tried it at different speeds and really nothing. Finally got an appointment at my local Cummins dealer for a complete service and PacBrake inspection.
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Old 03-04-2013, 12:17 PM   #9
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What transmission? The first time we had our allison 3000 serviced I asked about the engine brake and what setting it was on. They plugged in the computer and reset it for the lowest setting. That did not work for me as I felt that there was NOT enough braking through the engine. Took it back and had them reset the brake set point, much better.
Take the MH to a transmiccion shop for your transmission and ask them to reset the engine braking settings. I bet that you will be much happier!
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Old 03-04-2013, 02:56 PM   #10
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I think it is a 3060 allison. I will let the Cummins service center road test and advise on what needs to be done. I don't think its working at all. It could be as simple as a new floor switch or a complete rebuild. I will know in a few days.
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Old 03-08-2013, 08:31 AM   #11
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It turns out to be a bad solenoid. Works great now.
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Old 03-09-2013, 06:48 AM   #12
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Great , glad you got it fixed, thanks for the update.
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