2005 s-type 3.0
Problem
Steering is hard left and right, but if i turn right twice its loose until i turn left then its hard again same for turning left, i also always have to bring the wheel back to zero after turning with zero assist to correct its self. Pump is putting out pressure, all U joints seem to be free moving. Changed fluid but steering still stiff, could there be a problem with a hose or relief?
any help would be a great help
thanks

 

They're speed-sensitive so maybe the relevant part/signal is the problem. (Sorry, I've not looked into how it works!)