Proportioning valve leaks

67Dart273 said
First you must determine WHAT fittings this device has. Is it US or metric? Pipe thread or other? Brake tubing for older US cars is ALWAYS "inverted flare." That is not just a nickname, it is a specific fitting.

If the valve has pipe thread, you must have inverted flare --to--pipe thread ADAPTERS screwed into the device, and THAT thread MUST have sealer

The inverted flare fittings on the ends of the brake tubing NEVER uses sealer of any sort. They seal directly with the flare seating

Next, did you flare this tube yourself? Did you perhaps use the wrong flare tool? Inverted flare and SAE flare are both 45 degree flare angle. JIC and AN fittings are 37 degree flare, and they are distinctly separate tools.

they are pipe thread adapters for inverted flare lines. I did not flare them myself, they are manufacturer double flares. There is nothing wrong with the flares because nothing is leaking out of the brake line fittings, the adapter fittings with the pipe thread that go into the valve are whats leaking. Now, you mentioned using sealer on them, what kind do you use? Just regular old silicone? I have some Permatex Right Stuff I could put on them, that stuff works pretty well.