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all kinds of ways to control a pacbrake, a floor mounted foot switch I suspect you simply Press sw = brake on, release sw=brake off. It could also be tied to the brake light circuit so enough brake pedal to turn on the 5PSI brake light switch rolls on the ex brake valve. I liked the config...

Well I start by listening in a quite place, don’t, forget the vents on the front brake QR, rear relay and the pedal vent up behind the dash. Listen in on the glad-hands also. Then I feel every line fitting and vent for any moving air. Then I bubble mix every fitting And valve body, don’t...

How long does your shop air compressor hold air:) if everything is sealed and working properly it should hold air a long time…

That snot much of a goal, just fix all your leaks…:)

Yea the park springs should start to engage brakes ~60-65PSI with the brake force increasing steadily as the pressure drops. The rate of application will depend on how fast the air is leaking…. The springs can supply about 50% of the brake force that full pedal can apply to the rear axle… as...

The manual has all kinds of inconsidtencies😁

~85 sounds right for the lmtv gauge sensors. 66 Is the industry standard/FMVSS required minimum low brake indicating pressure. The pressure setpoint for the sw in the pressure sensors is ~85, and thats where mine used to alarm. This makes your alarm a little more sensitive than most air brake...

Yea the manual is full of errors/omissions. I forget which port/sender is which. I removed my senders and installed a dual needle mechanical and standalone low pressure switches when I did my dash makeover so I have no way to check more easily than you can… The simple way to check is to drain...

They should never be pegged at any point. All the gauges are 24v but use 12v lights...

You are right the gauge should not jump around and should read sensed pressure as soon as power is applied. The gauge sensors are dual function. They have 3 connections, 2 terminals that complete circuits to the sensor case, which must have a good connection to ground. One terminal is a low...