Do Brake Lines Need to Be Double Flared?

All brake lines need to be double flared, due to the high hydraulic pressure. If your brakes leak or the hoses crack, it could prove to be fatal. Single flared lines are suitable for low-pressure lines in other applications, but not your vehicle's brakes.

What type of flare is best for brake lines?

A tube sleeve or any sort of flare seat support is not required due to the extra wall thickness of the double flare that this style uses. The 45-degree inverted flare is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer.

How perfect do brake line flares need to be?

The basic types of brake line fittings.

The head of the flare is made at a 45 degree angle. AN or army/navy fittings are always a 37 degree fitting.