Two styles of tubing flares used by most vehicle manufacturers are:

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Multiple Choice

Two styles of tubing flares used by most vehicle manufacturers are:

Flare type is about how the end of a tubing fits and seals with its nut under pressure. The two styles you’ll see most on vehicle tubing are a double flare and an ISO (ISO 60-degree) flare. A double flare is made by forming the tube end into a conical seal and then folding the tube back on itself, creating two sealing surfaces. That extra fold makes the connection very strong and resistant to leaks from vibration or high brake-line pressure. Because of that robustness, it’s the standard choice on many American-made vehicles and a large portion of typical brake lines. ISO flare uses a distinct seating angle (60 degrees) and is designed to match ISO fittings found on many foreign and some newer vehicles. It provides a reliable seal with fittings that follow the ISO standard, making it the other common option across different manufacturers. Other flare types, like single flare or bubble flare, are less common on modern brake systems and aren’t the two you’re most likely to encounter across the industry. The note about materials such as neoprene or stainless refers to the tubing or hoses, not the flare style itself.

Flare type is about how the end of a tubing fits and seals with its nut under pressure. The two styles you’ll see most on vehicle tubing are a double flare and an ISO (ISO 60-degree) flare.

A double flare is made by forming the tube end into a conical seal and then folding the tube back on itself, creating two sealing surfaces. That extra fold makes the connection very strong and resistant to leaks from vibration or high brake-line pressure. Because of that robustness, it’s the standard choice on many American-made vehicles and a large portion of typical brake lines.

ISO flare uses a distinct seating angle (60 degrees) and is designed to match ISO fittings found on many foreign and some newer vehicles. It provides a reliable seal with fittings that follow the ISO standard, making it the other common option across different manufacturers.

Other flare types, like single flare or bubble flare, are less common on modern brake systems and aren’t the two you’re most likely to encounter across the industry. The note about materials such as neoprene or stainless refers to the tubing or hoses, not the flare style itself.

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