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Posted by Desoto61 [68.10.214.249] on Saturday, February 23, 2013 at 20:46:14 :
In Reply to: Re: Help needed! Brake bleeding posted by TGP (IL) [205.188.117.11] on Saturday, February 23, 2013 at 19:34:37 :
The threads are just there to hold the flare to the seat. Its the double flare on the tubing that is supposed to deform against the seat of the part and form a metal to metal seal.
If you have leakage then you don't have that seal and wherever the fluid is getting out air can get in.
Sometimes loosening and re-tightening the fitting a few times can get the flare to seat. But if it's a home made flare it may just be bad and need re-done.
If it's stainless tubing it may not want to seal due to the hardness of the stainless. It doesn't deform to seat well. In that case you can find small brass washers that will act like a gasket between the flare and the seat.