Single Flare Steel Brake Line

Due to the welding there will often be a rough area inside the tube.

Single flare steel brake line.

Never use a single flare on automotive components. While you might run into single flared lines in an automotive design elsewhere you should never see them in the brake system unless someone has gone into repair the brake system and not put it back together correctly. Single flares are only acceptable on low pressure lines but not acceptable for high pressure brake systems. If the brake lines aren t properly flared you can lose fluid that will cause your brakes to fail.

Flaring brake lines ensures a leak proof connection without extra materials or sealants. The sae double flare standard is remarkably tolerant of production variations but the assemblies must be the same standard. Single flares are never allowed on steel brake lines. Single flares are not acceptable for brake lines and tend to crack and leak quite easily.

A single flare will present the rough area onto the sealing surface of the fitting and you ll likely get leaks. Steel brake line tubing tends to be manufactured by forming a strip of sheet into a tube and then welding the seam. This article will explain how to flare your brake lines using single and double flares.