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Old 06-02-2016, 12:11 PM   #1
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Rear air brakes

Winnebago Journey 2001 can some one help? Air pressure warning light n buzzer comes on and needle on air gage bounces from zero to 130 lbs not loosing air pressure rear brakes don't lock but drag some then we pull over n the light n buzzer go off n all is good go down the road n all happens again. Anyone have an idea as to what the problem is? Had it into freight liner they found nothing?....
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Old 06-02-2016, 12:49 PM   #2
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Probably the VDU/VDC. Mine went out in my old Journey...same symptoms. The unit is mounted in the engine compartment and the contacts are cold soldered that work lose. The VDU converts the air pressure over to an electrical signal that's sent to the gauges. You can re-solder or replace. Just do a search for VDU/VDC and you'll get a a bunch of hits describing the details. I believe tube has videos on how to re-solder. Good luck.


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Old 06-02-2016, 01:06 PM   #3
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Quote:
Originally Posted by ecurb74 View Post
Probably the VDU/VDC. Mine went out in my old Journey...same symptoms. The unit is mounted in the engine compartment and the contacts are cold soldered that work lose. The VDU converts the air pressure over to an electrical signal that's sent to the gauges. You can re-solder or replace. Just do a search for VDU/VDC and you'll get a a bunch of hits describing the details. I believe tube has videos on how to re-solder. Good luck
I have almost the same problem. But even when the gauge drops to zero and the buzzer goes off, the brakes don't engage at all. I've had it in for service but they couldn't duplicate the problem because it generally doesn't occur till I've driven at least 80 to 100 miles. I was told there was no "real" problem and that it might just be a loose wire behind the dash. Also, it's only the left gauge that has that issue.

Thanks for the tip, I'll check the VDU/VDC as soon as I'm able.
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Old 06-02-2016, 01:48 PM   #4
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I have almost the same problem. But even when the gauge drops to zero and the buzzer goes off, the brakes don't engage at all. I've had it in for service but they couldn't duplicate the problem because it generally doesn't occur till I've driven at least 80 to 100 miles. I was told there was no "real" problem and that it might just be a loose wire behind the dash. Also, it's only the left gauge that has that issue.

Thanks for the tip, I'll check the VDU/VDC as soon as I'm able.

Yes sir, my experience also. It was after it got good and warm. I guess the thermal expansion thing going on with the cold soldered joints in the VDU. I chose to replace mine instead of re-soldering. The VDU knows there is enough air pressure. Its that the signal gets lost going to the gauge.


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Allison HD4060R 6 Spd W/Retarder
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Old 06-02-2016, 09:35 PM   #5
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Welcome to iRV2.

Here's a file on your problem , so you don't have to look for the U tube .
Attached Files
File Type: pdf VDC troubleshooting.pdf (130.3 KB, 22 views)
File Type: pdf VDC_Repair FL VDU.pdf (235.5 KB, 19 views)
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