Power steering pumps is failing on my 88 560SEL. I have done a search and only found info on power steering rebuild. I have the kit and it looks like it only fixes leaks. My pump does leak, however, it moans non stop when full of fluid and is loader when turning. Anyone know why? The fluid is bit foamy after turning the car off.

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David
1988 560SEL, Green, Chrome wheels.
2000 Suburban, 20" wheels, DVD, wood grain dash (wife's car).
67 Beetle euro, Lots of Empi parts.
69 Beetle conv, 1980s cal look.