I cant find a 3/16" brake line with 7/16" fittings, which is what my truck requires. I can only find the correct line with 3/8" fittings. I am wondering if this 7/16" male to 3/8" female adapter will work for a vehicles hydraulic brake system.
Bob(Certified Scuba Instructor at Scuba.com):
Unfortunately there is no way for us to know for certain as the more important information is going to be the thread pitch. It is not uncommon at all for hydraulic and pneumatic fittings to use a completely different type of thread pitch.