Marti

Bertrand Daoust

I can't say if the reservoir is susceptible to crack but if leaking I would change both. Reservoir and hose.
Not expensive.

Mrmerlin

What Bertrand said

SwayBar

Try snugging its hose clamp first, doing so solved my leak many years ago.

Crumpler

Also, remember ATF is somewhere between flammable and combustible. Make sure the leak is not more comprehensive then first glance allows.

NoVector

Probably a loose hose clamp, but there's an integrated filter in the reservoir if you're looking for another reason to swap it out.

Marti

dr bob

jpitman2

The hoses dont last well with ATF, so I would start by replacing those ends connected to the reservoir. I had a lot of trouble getting ends to fit readily, so I introduced a steel hydraulic fitting reducer and 90deg angle to ease the size transition and direction change. Has worked well for several years now. Couple of extra hose clips involved, they are all easy to get to.
jp 83 Euro S AT 57k

TheoJ

When the hose gets older the ATF tends to seep through the wall. Tightening the clamp will not help. The hose from the reservoir to the cooling lines is attached to metal the cooling lines at the front of the car. You can cut the hose off by cutting the crimped clamp at the metal line, and a 12mm ID rubber hose will be a good replacement. I used nitril rubber version as this is more ATF resistant.
The hose from the pump to the rack is a pre-formed hose, 928.347.445.06 for my GTS. You need to buy this one as a standard hose will not fit easily.
More info here: Steering reservoir hose repair
Theo
1992 928GTS Midnight Blue

Kevin in Atlanta

I've read here that some folks have moved from ATF to power steering fluid. Does that change the calculus of why the lines fail over time?

Marti

FredR

I had exactly the same problem and replaced both low pressure hoses when refurbing the high pressure hose. Should probably go on the pre-emptive "replace list" after 10 or 15 years of service if one wants to avoid them sweating ATF as they invariably will do. My reservoir is still holding firm but I wonder how the plastic is holding under all that heat and exposure to hot ATF.

Wisconsin Joe

Don't forget that the reservoir has a filter in it.

My hoses were pretty much shot, but I chose to replace the reservoir at the same time, even though the leaks weren't coming from it.

It's surprisingly inexpensive for a Porsche part. Roger has them.

FredR

The reservoir does have a strainer to prevent house bricks and the like from damaging the PS pump. I blew some air through the pump suction line to dislodge anything that might happen to have been in there but saw no signs of anything. I would have replaced the reservoir had I had one to hand which hopefully I will have shortly. The reservoir does seem quite robust and they are a bargain comparatively speaking.