Level Low Question

[Joe Camper]

The newer buses with the aux air gauges in the dash U can see this going on when U R on the up button in level-low. If the air compressor is idling not pumping when U first try the aux tank needle drops well below where the brake tank pressures are. If the brake tank pressures aren't dragged below 100psi where the cmpressor kicks in (and this is exactly what is occurring at this point) U can lay on that up button till hell freezes over and nothing will happen. If U pump down the brake tank pressure get the compressor going and try up when the needles are at 110psi and headed north NOW the difference in the 2 systems is just a slight bit. I am going to tap a pressure gauge into the front bags on a double slide bus one of theses days. What kind of pressure are we dealing with at ride height and what additional pressure from there to go up. IMO and based on what many here experience I think it is just a bit too close t 120psi and as few as 3 or 4 PSI increase in the shut off very often eliminates the shortcoming.