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Have rebuild two 944 racks using rebuild kits from 944 online...and both continue to perform perfectly and remain leak-free.
Not all that difficult but a bit tedious, with a bit of extra care required for certain aspects, like removing tie-rods from the polished center carrier without marring the carrier, and replacing certain inner seals/O-rings without marring any critical surfaces.
And that carrier needs to display a high degree of polish, and be more or less perfectly cylindrical in cross-section, in order to maintain leak-free performance in concert with the O-rings through which it travels. Its not uncommon in an older rack to have this carrier display a bit of surface-rust, which can often be removed and the polish restored...but this must be done in a way which preserves (within tolerance) spec'd diameter and concentricity in order to remain leak-free. Some folks will chuck the carrier into a drill press and spin-polish with very fine grit paper (1000/1500/2000 then fine compound) - but I have not needed to try this.
Also, obviously replace all crush-washers, and maybe refresh (flatten/polish) surfaces which will be sealed by new crush washers. And be really careful not to over-torque any banjo bolts!
Finally, if a high pressure hose looks distorted, cracked, etc. - replace it!
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