Technical Leaking valve

Brake line residual valve is leaking.1960 Bel Air ; disc/drum, dual master cylinder. Is there a way to seal the threads?On that one end there is not a flare fitting.I have a new residual valve that I will install

 

Are you using a pipe to flare fitting?

 

Yes but it leaked. I want to know what to do, to prevent a leak , before I install the new part

 

depends where it's leaking from. Make sure the threads are all the type that you think they are. If the flare on the tube is defective, it will leak. You would need to cut off the end, and make a new double flare.

 

Installed new line from mc to the new residual valve.Tightened everything before installed in the car.No leak.Tomorrow I will bleed the rear line and drive the car;to see how the brakes are.

Thanks as usual

 

residual valve leaked- new outta box.took it out of the system.A buddy stated I need a proportioning valve; so i ordered one.

 

Are you using tape on flare fittings??