LXI SUSPENSION ISSUE

[cmillsap]

(10-20-2014 23:17)davidbrady Wrote:  Chuck,

We may have to wait for Al to chime in here to confirm his tag axle air pressure gauge reading. I'm not following where you would plumb the pressure regulator; give me a schematic item number if you can Chuck.

The charts for his drive axle bags (Goodyear 1R11-152) show a requirement of 90 psi for a load of 5805 lbs per spring (23,220 lb total) at a design height of 8 inches. If his bus is plumbed per your schematic without any changes that would place the same psi, 90, on his tag axle air springs. This means that the proportion of load split between the axles was chosen by BB when they selected the tag axle air springs. Here's what we have recorded as the air spring for the steerable tag axle: Firestone: W01-358-9387

David,
I do see what you ment. I looked the schematic over pretty throughly and I do not see a pressure reduction valve that is located between the tag and drive air susp system. Could be that the schematic is obsolete or not the correct diagram. I do know that there was a tag pressure reduction valve located on the rear center of the tag axle on my steerable tag equipped LXi. The reduction pressure was pre set at 55 psi and was non adjustable. It had to be original equipment by BB as it was burried under the foam insulation and hard to find. Rick at CoachWorx did the changeover for me. If I remember correctly there were just the three lines connected to it. They were the supply line & right & left lines running across tag axle to the air bags. I think the steerable tag air pressure should run approx the same air pressures as a fixed tag at about 50 to 70 psi but I'm not sure. I have not heard of anyone running 100 psi on their tag axle. Except Al of course

It's entirely possible that valve was bad on my bus and was originally set at100psi. But wouldn't that be higher than the rest of the air suspension system? Why have a reduction valve there unless it was to run the tag at less psi than the drive and steer axles?