pump->bomb, round 2; overpressure?

Brett Dikeman brett at cloud9.net
Wed May 22 12:20:35 EDT 2002

So the rebuilt hose burst after about 3-4 hours of operation.

Same exact failure mode as the last; trickle at first, and then a
nice big stream.

So the official hose is now sitting next to me, waiting for
installation.  Not only did it come early(Airborne is not exactly
known for their punctuality) but it appears I got the "dee-lux" kit.
I've got:

-the lower hose
-two banjo bolts
-all 4 replacement o-rings
-plastic restriction tube with attached brass collar/fitting

The cute part is that the old hose was suspiciously missing said
plastic tube(brass piece was still there, of course)...probably ended
up buried towards the end of the old hose...and maybe the lack of
this little restriction tube caused the hose to blow from pressure

Also, while I tried hard to get the hose lined up exactly the same
way, I've heard that funny bends can make 'em fail too?  Naturally
one installs the hose with the joint between them loose so the two
can twist, but...

What most concerns me is that some sort of pressure relief valve on
the pump has gone and the pump is overpressurizing the line...and
this(much more expensive) factory replacement hose will be casualty
#3.  Any opinions on this?  As I joked to my father, "over-pressure
and over-delivery are not exactly the normal problem with Audi
hydraulic pumps...", but you never know.

Last question...which hose does the long end of the plastic
restriction tube go into?  The lower or upper hose?

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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