W-27

I have a 68 442 which i converted to front disc brakes (1971 model with single pistons) and i am on my second proportioning valve in 2 weeks due to the fact that it leaks from the metering valve. Its made by MBM model PV2. I used silicone brake fluid as i put new stainless steel lines as well. I can i stop it from leaking? Do i need to remove the metering valve and sealed it with white tape used for brake lines? Is it due to different viscosity? Please help.

joe_padavano

The combo valve uses inverted flare fittings, which seal on the flare. Tape on the threads is useless; the threads DO NOT seal. If two new valves leak, the problem is probably not the valve but the flare on the line going into it.

W-27

W-27

Joe, what would you suggest i do to alliviate the issue? The leak is defenetely coming from the metering valve.

Tom442

I understand you put new Stainless steel lines on this valve. I have done some double flares on regular tubing before, they looked perfect. BUT there was a tiny line on the face of the flare where the tubing was seamed that caused a leak. You might want to really closely examine those flares.
Just a thought.

70cutty

If you are using stainless line, it has to be really really tight. I had the same problem when I switched my lines to stainless, it leaked at almost every connection. I had to tighten all of them as much as I could.

W-27

Tom, what did you do to fix the situation?

W-27

I did that, they are as tight as i could make them any more and they would strip the threads.

Tom442

I had to re-bend the lines (lucky it was the front left) and they held the second time around...