Brake lines leaking

[Johnny Blaze]

I installed new brake lines, and used a line wrench to tighten them ,snug. I am getting drips at just about every connection. Lines are new, hoses are new, calipers are new. On the calipers I used copper washers on both sides of the fitting. At the prop valve I am getting a leak too. I did not use any teflon tape or paste. Installed all with dry threads.

[BulldawgMusclecars]

I'd check the quality of the flares...if they are pre-bent lines, they are rarely an issue, but its worth checking, along with the fittings and threads themselves. You may just not have the fittings tight enough. Flares shouldn't need any tape or other sealants, but if you have an aftermarket prop valve with NPT fittings, the NPT side will need tape or thread sealant.

[esenior]

As Joe mentioned, pre-bent lines are rarely an issue, but if your brake lines were custom made, make sure they didn't use a 37 degree flare. 37 degree is used for AN fittings, but brake lines use a 45 degree double flare.

[rohrt]

tighten the nut then back it off and retighten. You will find when you retighten a second or third time you can turn the nut further. As stated above make sure the flare are good and also that the part your tightening to is not bunged up.

[Johnny Blaze]

Thanks for the tips. Yes they are prevent lines. Prop valve is gm. I'll check them out again.

[Skip Fix]

I took apart a line to move things around and thought I had it tight and it leaked(GM line). Had to really crank it tight. As the others said sometimes there can be a nick in the flair on either end.

[oestek]

I like to dab a little assembly lube on the threads to help them squeeze smoother without galling... this way, you feel the flares tightening together rather than threads galling.

[mild2wildpaintngraphics]

Are they stainless steel lines? They are much harder and more difficult to seal.

[Apogee]

tighten the nut then back it off and retighten. You will find when you retighten a second or third time you can turn the nut further.

X2...loosening and retightening is the best way to seat the sealing surfaces without over-torquing the fittings.

Tobin
KORE3