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Yea I think he used a 3 segment run-flat which would be symmetrical/balanced…

What tire pressure are you running, that might effect “sponge”. Did you check toe-in? Easy enough to do on these trucks.

Ok, now I am tracking. You may be right the 2way function to combine either pri or sec may be in the park/trailer control… on the A0 its a standalone 2way check right at eye level when you open the drivers door…

Yea like the wet tank plumbing so far, I suspect this will probably turn out to be an A0 thing. Unless you are specifically looking for it, It is up under the bed and not easy to see Unless the bed is off. i have looked at all that plumbing perhaps a hundred times, but it took having my head in...

Yes the top one under the drivers floor with the switch is where the front red glad-hand and air from the park control combine to feed towards the rear. That switch controls the park and emergency lights in the dash.. the lower two valves tied together are blue service glad-hand input to the...

Yea I think they did away with the park air controlled AOP supply valve in later trucks. I have seen one where the AOP supply is fed from one of the Ts on the wet tank. the park air control supply 2way is in the cab on the forward bulkhead In the A0. not sure where it is at on the A1s.. pri...

I suppose anything is possible but it would require elbows placed where Ts are supposed to be and vis versa not to mention the line lengths might not work out for re-attaching existing lines. It would take some extra effort to re-plumb, especially like General mentioned, usually one piece...

Yea I would say belt failure or tread sep, that or your run-flat came undone:) its AWD, if you chock the rears and leave the park brake on, you can jack up one front at a time, start up, put it in D and rotate one wheel at a time to see if anything is out of round. You by yourself? You could...

I don’t have any emergency brakes! You probably don’t have any either… Emergency brakes: someone came up with a method to use the park brake springs with pedal input in the event you loose your primary/rear brake air. Its Completely automatic, no additional operator workload. its the whole...

Well that drawing has some issues. Did they do away with the load proportioner On the A1? that low pressure warning switch in the middle of the drawing is actually what controls the park and emer lights in the dash(plumbed to park circuit). They have the dryer output bypassing the wet tank...

Wow in looking at this, i reviewed my brake component video and I just found another, what looks like from the factory, problem with my brake plumbing… Because the anti-compounding valve is not fed from the correct source, i don’t have any emergency braking capability. I wonder, if like the...

them both leaking down equally is a good clue. The primary and secondary air are tied together in 3 other places. 1. Under the drivers dash. There is a two way check valve there that samples either system to provide park and trailer control air. 2. Inboard of the service tanks there is a 2way...

Well the governor only has wet tank air at its disposal to feed the purge valve. At worst this would leak away that air, but any loss of service air is happening elsewhere…

Hmmm isn’t there an outlet check valve? I am thinking that this thing should go to at atmospheric pressure every time the governor unloads and commands the purge. if it is shut down while the compressor is online the only pressure that should be able to leak away is the air in the dryer case...

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…

Yep, garbage in, garbage out…

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...