Can anyone confirm the brake line size for the line running from the front to back of my 2006 Mega Cab is 1/4" line with M12x1 fittings? I'm having a heck of a time finding line and fittings for that combination locally. If the line isn't supposed to be 3/16", will 3/16" work? I can get 3/16" line with the M12x1 fittings.

 

I figured out it is 1/4" line and the fittings are M12x1 bubble flare. (it's a bubble flare fitting, but with a standard double flare on the line) Those fittings are next to impossible to find. Through my internet research I was only able to find two or three companies that even made them. You won't find them at the local national auto parts chains. I ended up reusing my original fittings even though I kind of rounded off one taking it loose and chewed up the other one putting it in a vise to get the line out of it. It was that, order the fittings and wait 3 or 4 days, or make a 2+ hour round trip drive to get them.

For anyone that runs across this in the future, here's some part numbers:
Fed Hill Part: M8-4
http://store.fedhillusa.com/m84.aspx

SUR&R Part: BR2200
https://www.grainger.com/product/52HH09?