Deleted

Each bag should have its own line. Normally the pairs should have the same inflation, but if you leave them tied together and aren't level, the air can travel back and forth, defeats the purpose for roll control.

Where you run the lines is a matter of choice and convenience. If you run long lines be sure they won't be near anything hot or sharp.

Front bumper makes sense for front bags. (Since they never seem to need air I just fill my front ones directly from beneath, didn't bother with lines.)

I ran my rear bag lines into the compartment behind the door, with gauge and air valve on each.

BTW 60 psi seems to work real well in the rear bags.

quote:

Originally posted by Steve VW:
Each bag should have its own line. Normally the pairs should have the same inflation, but if you leave them tied together and aren't level, the air can travel back and forth, defeats the purpose for roll control.

Actually, it makes things worse, as the air forced out of the low side pushes the high side higher.

quote:

Front bumper makes sense for front bags.

Yes, don't make the mistake some do, and put the fillers where the tires can throw rocks at them.

quote:

BTW 60 psi seems to work real well in the rear bags.

I like to have level frame rails. A good alignment job starts out with level rails, and I try to stay good in that regard. Caster is very dependent on frame angle. And, of course, caster is important for tracking stability.

I blow up the front for the desired bump stop clearance and then adjust the rears for a level frame rail. this can vary with cargo, tank full or not, motorcycle or not, trailer tongue load or not, etc.

The factory Barth trim rail is pretty close to frame rail as far as level goes, so I measure level there. I had a stick on level, but it became unstuck.

Assuming no tag axle, every coach or bus that I know of uses the same basic setup. At the front the airline goes to a height control valve and then T'ed off the valve output to each front wheel. In the rear an air line goes to a height control valve for each wheel. If you have two bags on the wheel (front or/and rear) there is a T at each wheel and both bags are filled from the same air source.

If you have dump valves, they will be between the height control valve and the wheel.

If you have an air leveling system the same is almost true. HWH has or had a diagram on there web site. These were used by Prevost conversions and Newells.