On our '86 Syncro Westfalia, the power steering pump has developed a leak. It
only leaks when I take tight turns and it only leaks from the pump shaft area.

My question is, is my problem only with the pump or should I look at the rack
for the cause of the high pressure on tight turns. I have a spare pump if that
is all that I need. But my concern is that somehow there should be a relief
valve in the rack which isn't functioning. Can anyone shed some light on how
this power steering system works?

-Larry