[jdkskyking]

looking at the circuit, does increasing the pressure in the accumulator increase the pressure on the rear cylinder “centering” ? It is my understanding the centering is needed, because of the unusual design of the master cylinder up front. The bypass section in the master which permits +/- 5 degrees of movement would also infer that the rear cylinder is free to move +/- 5 on its own if that float is permitted in the hydraulic loop coming from the master. Therefore some mechanism is required to keep the tag cylinder centered.

So losing pressure in the accumulator would result in less recentering force.

I don’t have any hands on experience with this, my comments are just from trying to digest the literature that Jeff has provided. And I could have a really flawed understanding.

I enlarged an area of the ZF RAS system explanation. 

The question I have is what exactly “centers” the TAG Axle?

   

As with the front “Master Cylinder” and the “Rear Centering Cylinder”, each cylinder has separate chambers that complete different work. 

In the Rear Centering Cylinder, the chambers on the actuating rod side react to the movement of the front Master Cylinder “CENTER CHAMBERS. 

The “anchored” side, IMHO, simply holds the axle in position with system pressure. Equal pressure applied to each chamber. 

So what “centers” the tires? Master Cylinder gets it close but then there’s the 5°… or is it 10° total? Details the ZF info doesn’t provide.