Important.........The tire pressure charts reflect single and dual wheels.

In the case of the tag and steer axles use the inflation pressures specified for single and on the drive axle use the dual wheel inflation pressures.

All are cold pressures, and as a practice I add 5 PSI just to provide a small cushion of added safety should I develop a leak I do not detect right away. If you have a tire pressure sensor system you don't need that extra pressure because you will get an alert before it becomes an issue.

Remember...if you run a tire at 20% less than the specified pressure you have effectively ruined it and driving on it could compromise safety. That is not me talking but the tire manufacturers themselves all stating that.

As to Steve's comment about ride height and the relation between it and any axle weight I do not understand how that impacts axle weights. We only have 3 ride height vales. One centrally mounted for the two front axle air bags, and one on each side (located ahead of the drive wheels in the wheel well) for the left or right rear. When the ride height valves are in the circuit (they are out of the air circuit when in the level low position) the rear ride height valves supply air flow to or remove air from the 3 air bags (2 drive one tag) on their respective sides. All three rear air bags per side have equal air pressure in them regardless of the height adjustment.

Having said that the drive axle air bags are different than the tag air bags on coaches I am familiar with. It is that diference that maintains the weight distribution in the rear between the tag and drive. The tag air bags are generally the same as the front air bags and are slightly greater in diameter (although described as the same) than the drive air bags. The only way to adjust the relationship of weights on our coach rear axles using the leveling / ride system is to use varying size air bags as Prevost has already done.

There has been a misconception in the past that the ride quality on our coaches can be adjusted firmer or softer by adjusting air bag pressures. That is not the case. Using the ride height valves brings our buses to a specified height by adding or exhausting air from the air bags until the bus reaches the set height. The air pressure increases or decreases based on the loads each set of air bags must carry. A bus with a heavy front for example is going to take a lot of air pressure to rise to the correct ride height, or less if the front end is relatively light.

In the case of the 3 rear air bags on each side they all share the exact same pressure because they are all interconnected when thye system is in the road or driving position.