Re: ATF in a hydraulic oil car. BTDT?

[Kneale Brownson <knotnook@traverse.com>]

That's where mine on the 5kcstq was leaking, Phil:  from beneath the
screw-on caps that cover the pistons.  I realize this is a different pump
from the one you describe, but I mention it because I had an incident a
year or so before the leak began where I caught a dummy at a quick-lube
place pouring brake fluid into the Pentosin reservoir.   The mechanic I was
using then flushed out the system with a couple liters of Pentosin, but not
until I had driven the car about 25-30 miles, and I never was certain that
flushing was the proper procedure (as opposed to draining and then
refilling).  It was my understanding that the most common leaking was
between the halves of these pumps.

Kneale Brownson


At 04:00 PM 8/9/99 +0000, Phil Payne wrote:
>I know putting ATF in a hydraulic oil car "rots the seals".  But which
>seals exactly, and how do the problems manifest themselves?
>
>I had a car in on Saturday with miscellaneous brake problems.  A
>left/right dive seems to have been fixed with a good bleed, but there's
>something very odd about the hydraulic assist.  The pump is the later
>square item fitted to the 20V Coupe and the MB, and it's leaking from
>the forward (high pressure end) piston caps.  Is this where they leak,
>or am I looking at a bad rebuild?  The car has only 85,000 on it - 1988.
>
>--
> Phil Payne
> UK Audi quattro Owners Club
> Phone: 0385 302803   Fax: 0870 0883933