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Removing the priority valve (pressure closing valve) is a very very bad idea ! It is there to make sure you still have air assist to the brakes if the air assist steering fails. If you have a big leak in the steering (or any other air system problem) and the air system drops below the set...

Its always been hard to steer, or that is new with the low air ? If you've got a leak, that means that the air cylinder isn't getting enough air. If you got a stuck valve in the drag link so that it is exhausting air when it shouldn't (or all the time), then the cylinder won't build enough...

Well, that at least narrow the possibilities for leaks. Has to be the drag link, hoses and fittings to the cylinder, or the cylinder. Have to get down there with some soapy water and get the joints wet while someone else moves the wheel. I'd do it with the engine off so you can hear, rear...

If it's a new leak (leaking all the time, not just when the steering wheel is moved), the most likely cuplrit (again on the M35a2 install, looks like the a3 setup is the same based on the TMs) is the useless, cheap, crappy regulator in the air assist system. If you have one (the latest...

On a M35a2 with the air assist installed, when you are maneuvering a lot at idle (in my case to get it parked in the back yard), the air assist uses air faster then the compressor can keep up with. The air exhausting out when you switch the direction you are turning is normal, as is the exhaust...