Confused by brake line fittings

how to verify brake line fittings are CORRECT

Front Brake Line Junction/Fitting Size Question/Confusion. Please read

Having trouble finding the correct brake line fittings. Does anyone happen to know where I can get the “European” ones or at least identify them? Or can I just rethread the old

Mitsubishi 3000GT VR-4 (1991-1999) Stainless Brake Lines – B-Line Performance

Feeling The Pressure - Brake Lines And Hydraulics - BuyBrakes

Speedway Motors Brake Line Fittings Adapter, 3/8 Inch-24 IFM to -3 AN Male Steel Brake Adapter Fitting, Connector Brake Line Adapter, Ideal for Master Cylinders, Wheel Cylinders, Calipers

4lifetimelines - Brass Adapter, Female(3/8-24 Inverted), Male(3/8-24 Bubble), 10-Pack

(BLP-1) cross-section

Emergency Brake Line Plug- M10 x 1.0

Had a hole in the brake line and the mechanic fixed it with this. Is this a compression fitting or an actual brake fitting? I don't know car stuff a whole lot

Grenada brake line question

Brake Line Fitting Adapter Brake Line Fitting,3AN Male To 3/824 Metal Brake Adapter Fitting,HAF01 Inverted Flare Brake Line Adapter Inverted Flare Adapter Fitting Fittings

Size; Female 7/16x20 UNF as pictured. These are top quality fittings made from solid brass, do not confuse with cheaper steel fittings. Fits 1/4

Brass Brake Pipe Fittings 7/16 x 20 UNF Female 10 PACK for 1/4 Pipe FL16