Alarm Warning Questions

To sort things out some...Look real close at air pressure gauge...does your air pressure gauge have one or 2 needles? If you have 2 needles, one needle shows total amount of psi air in system and the other needle is the amount of pressure being applied to system.

If so...when fully charged up with air(if you can) ...apply brake, then does one needle keep going down? if so you could have air leak or spec of dirt stuck in a valve somewhere. Or if you're in cold climate right now, rubber in a valve is stuck (valve is not sealing air tight) because you have moisture in air system somewhere. Or maybe you drained your system and left valve open and leaking air. If any above applies problem is in air system not trans problem. Above is based on what I'm used to in air brake system.

( :)P.S. Ha, HA, Ha ...if you're on the clock right now...call your dispatch, tell them air is froze up. Buy 4 cups of coffee. Pour 2 into air system and 2 inside yourself. Both systems will warm up. Then after thawing, drain air brake system to get out water, then drain yourself later:))

Path1,
I have 2 needles on the gauge. One red and one green. Both move together. Owners manual says that one needle is for the front tank and one is for the rear tank. I'm getting 120 PSI on the air gauge so the pressure is good. Can't figure out why the alarm comes back on when I put the transmission into Drive?

EZRider800 wrote:
Path1,
I have 2 needles on the gauge. One red and one green. Both move together. Owners manual says that one needle is for the front tank and one is for the rear tank. I'm getting 120 PSI on the air gauge so the pressure is good. Can't figure out why the alarm comes back on when I put the transmission into Drive?

I am not used to separate needles for separate tanks. So I'm probably not much good to you. But did find this article, not sure if it will help.

http://www.rvforum.net/joomla/index.php?option=com_content&view=article&id=173:motorhome-air-brake-system-testing&catid=24:tech-topics

I had that happen sometimes. I would stop,pull up the knob for parking brake, then push knob down to release the brake and then the alarm would stop.

EZrider, what I recommend trying is to park on level ground. Chock the wheels and build the air pressure to 120/125 lbs. you should hear the air dryer exhaust and the compressor will cut out. Release the brakes, and watch the air pressure gauge. It should fall slightly then stop and hold steady. If not then you have a leak in the system. Walk around the coach and you should hear it. It may be helpful to have a helper on the inside while you are outside. If someone releases the brakes as soon as the low air pressure buzzer quits the buzzer will sound as the volume of air needed to release will result in the alarm sounding again. Hope this helps, let us know.

Mine will give the alarm when you are in gear and the parking brake is still set as a safety. It will also sound if the brake is released and I'm in neutral, again as a safety. If it's going off when you're in gear and brake released, I'd suspect an air switch on the parking brake that has gone bad. Does the park brake light on the dash go out when released?

Sometimes the answer isn’t to the question you’re asking.

Are you SURE it’s an air alarm? Not an alarm telling you that one (or more) of the levelling jacks aren’t fully up?

My ‘jacks down’ alarm only sounds when you put the transmission in drive or reverse.

path1 wrote:

EZRider800 wrote:
Path1,
I have 2 needles on the gauge. One red and one green. Both move together. Owners manual says that one needle is for the front tank and one is for the rear tank. I'm getting 120 PSI on the air gauge so the pressure is good. Can't figure out why the alarm comes back on when I put the transmission into Drive?

I am not used to separate needles for separate tanks. So I'm probably not much good to you. But did find this article, not sure if it will help.

[URL]http://www.rvforum.net/joomla/index.php?option=com_content&view=article&id=173:motorhome-air-brake-system-testing&catid=24:tech-topics

Great article. I had actually done some of those tests and the brake system seems in really good shape. The warning alarm when I put the trans in DRIVE has got to be something else. That's why I thought it was an Allison alarm but no one can tell me. Not even Allison.

BillofPA wrote:
I had that happen sometimes. I would stop,pull up the knob for parking brake, then push knob down to release the brake and then the alarm would stop.

Just leave it in gear when you do this? And the alarm would stop? Any idea what the alarm was supposed to be warning us about? lol

KevinE wrote:
Mine will give the alarm when you are in gear and the parking brake is still set as a safety. It will also sound if the brake is released and I'm in neutral, again as a safety. If it's going off when you're in gear and brake released, I'd suspect an air switch on the parking brake that has gone bad. Does the park brake light on the dash go out when released?

Mine will continue to sound the alarm no matter what combination I try of putting the brake on and off, putting the transmission in drive or reverse. The ONLY WAY to get the stupid thing to go off is to put the transmission in NEUTRAL. Then it stops almost immediately.
It doesn't matter if the air brake is set or not. If it's in neutral it stops beeping. As soon as you put it in gear it starts beeping again.