Originally Posted by RT 41
I can be heading down the road at 60 mph and the pressure needles for front and rear suspension will peg at 150 psi I can tap the brakes and the pressure will drop to 135 psi sometimes it will stay there and sometimes it will climb back up
Where should I be looking
I've not seen a rig with front and rear suspension gauges that peg at 150. So, I'll presume your front and rear air tank
gauges are reading at 150. Tapping the brake uses some air out of the system and so the gauges go down. and they'll stay down until the pressure hits the cut-in point of the air compressor governor.
Normal air pressure in a system is 100 -120psi or at times it is recommended to as high as 130psi. 150 is too high for routine use. The governor is generally mounted near the air compressor on the engine. It has an adjustment that can be made to lower the pressure at which the compressor cuts out.
It is possible that your governor has been adjusted too high, or that it is malfunctioning. It should be checked and your pressure returned to recommended settings.