What size original brake flaring nut on our TL?
 

It's the one that goes into the brake proportional valve. I couldn't find acura diagram but this is #4 in this 2001 Accord diagram. I assume this is the same flare nut used for the master cylinder and connecting the hydraulic brake hose.


I was planning to use standard 3/16" flare nut on it. I took out the original and matched it with the standard flare nut. The threads match up perfectly when held side by side but the diameter of the original flare nut is a shy bit wider. It still fits into the proportional valve snugly but I don't want to risk using standard nut. The top is rusted and chewed up pretty good when I tried to take it out with vice grips. Next time I take it out, I don't want to reuse this nut.

I'm having a hell of a time making nice double flares. I do one full turn to flare the tube but I think I need to only do 3/4 turn next time. I have to crank the fittings down super duper tight to stop the leak on 2 of 3 double flares I made.

Thanks!

M10 x 1.0 Tube Nut for a 3/16" tubing.

3/16 in mm is 4.7625. Do we use 6mm brake lines or what.