Power steering pump interchangeability for Audi 5000/100/200

[Ti Kan]

RJA writes:
> Does anyone know what the difference is between the hydraulic (power
> steering) pumps for the '89-91 200's (034 145 155C) and the ones for the
> earlier 5000's (134 145 155D)?  I've been told that the only difference is
> the pressure relief valve inside, but that they can be used interchangeably.
> Can anyone verify that?  I'm looking for a rebuilt pump for my '90 200 and
> have found a good source for a rebuilt ZF pump (034 145 155D) but want to
> make sure it will work.  Did the '90 200's use Pentosin CHF 7.1 or CHF 11?

Can't tell you what the difference is between those two part numbers,
You car should have come factory filled with the CHF 11S, and Audi now
only uses 11S for all cars old ane new.  The 11S is considered to
have superceded the 7.1 fluid (it inherited the same VW/Audi part number
G 002 000).

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
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