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Old 04-15-2015, 09:42 PM   #1
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Name this part - air brake related

Found these two devices plumbed to the air tanks on my 95 Diesel Dolphin (oshkosh chassis). One of them was unplugged. What are they? Sensor or sending unit of some kind? Also, the cables for the blow off on the tanks are bundled up under the coach. Should I be using them to drain the tanks once in a while? How often?
Thanks
Rob
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Old 04-15-2015, 10:03 PM   #2
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Automatic drain valves on the air tanks. The lanyards allow you to manually drain the tanks of water although the automatic ones should do it for you. In the 12 years we had the Dutch Star I never used the lanyards.
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Old 04-15-2015, 10:45 PM   #3
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Thanks D. I'll wire the other one back up and not worry about routing the lanyards to a better spot.
Rob
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Old 04-15-2015, 10:52 PM   #4
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Not to say you shouldn't EVER pull the lanyards though. The automatic valves can quit working. If you start seeing water when the air valve unloads then you need a new air dryer cartridge and maybe an air dryer rebuild. Pulling the lanyards will verify whether water has gotten into the tanks. DON'T be under the rig when you do it either as the rig can drop suddenly when the pressure is released.
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Old 04-16-2015, 08:18 PM   #5
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I would run the cables to a convenient place with easy access anyway. When/if you need to use them is not the time to have to crawl under the coach. Mine has automatic drains, the manual cables are routed to just in front of the LF wheel, above the frame rail. It's a easy reach with the awning hook. As Mr. D said, you don't want a body part underneath anything that will drop or move suddenly.
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