I bought a complete aircraft seal kit from Banaire about 12 months before they shut down. Recently I pressure tested the rebuilt (with Banaire seals) maingear retract rams & at 1500psi (1.5 times system pressure) they leaked pretty badly at the outer cylinder mounting end where the cylinder pivots slightly on the fluid transfer pin during gear movement.
After disassembling the rams our volunteer professional hydraulics engineer checked everything out & declared the seals.... well... something like "not very good".
He recommended off the shelf available modern type seals of the same dimensions from a supplier here in Australia:
http://www.nrseals.com/I bought the new seals & installed them... bench tested again at 1500 psi.... no sign of any leakage & everything "felt" much better going together.
Of course the supplier of the seals was not approved by our regulator but neither was Banaire for that matter.
These were the only Banaire seals which have given any problem so far.... all other's seem ok.