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Old 05-09-2014, 06:34 AM   #1
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How many ride height control valves do I have

I have a 2007 MADP with a tag axle and I'm looking for an air leak, I don't have the safety equipment to crawl under the motorhome so I'm just spraying the valves I can see with soapy water, I've found a ride height valve at each of the front tires (one is leaking) and so far have only found one ride height valve on the rear, I suspect I have at least 2 and as many as 4 but I'm not sure. Any ideas of how many valves I should have on the rear.
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Old 05-09-2014, 07:15 AM   #2
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Here is a discussion on ride height and links found in QT's 1 & 2.
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Old 05-09-2014, 10:15 AM   #3
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It is very common to have ONLY 3 ride height valves.
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Old 05-09-2014, 10:33 AM   #4
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2 in the front and 1 in the front.
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Old 05-09-2014, 11:21 AM   #5
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Yeah, two in front and only one in rear. There are also a couple Parker valves in this system that are known to leak.
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Old 05-09-2014, 12:11 PM   #6
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Thanks guys, 3 it is and it kind of makes sense. I'm also guessing that the reason I have two in the front is the independent front suspension.
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Old 05-14-2014, 05:59 AM   #7
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If you had 4 valves, the 4th valve would need to be set so the back axle is exactly level when the front is exactly level (assuming a flat floor, of course). If they were not set the same, the body would twist (bad) or 2 opposite corner tires would have a tremendous weight on them (also bad) in an attempt to get the ride height that was set. With only 3, those problems are eliminated.
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