Quote Originally Posted by DennyW
Well, maybe not off, but I would think the O-ring surface would have to be a good matting surface for a good seal. If the casting is rough where they would make contact, that may be the problem. Most O-ring surfaces are grooved like a pocket for the O-ring to partially seat into.

ps: I have also ground the fitting on the end, if it did not seat in the proper position. I felt better having a matting surface (contact on the inner flare). They do build quit a bit of pressure if you have to stand on the brakes.
yes that is the way i see it. the amount of psi and no receiver for the o ring with a strait theads with no seat for the fitting to seat up to .you are using the o ring and not the way it was made to work .i would want more than that for a brake system