Oh Vanagon Diagnostic Gurus:

I've noticed for the last few months that when my steering wheel is
turned to its full travel - either direction - I can feel what's best
described as a throbbing or a surging (at a rate of about 2HZ, for you
engineers out there.)  There is no particular noise accompanying this
phenomenon, just a vibration that I can feel through the steering wheel
as if it is pushing back at me.

Is something in my power steering system about to die on me?

I typically notice this when I'm backing into or pulling out of a tight
parking space, when the wheel is turned all the way over. (I never notice
it while I'm driving at speed, since I don't do donuts in my Syncro ;-)

Any guesses at a diagnosis would be greatly appreciated!

-Steve
'89 Syncro GL