Fuel & Brake Line Lapping Tool
Mark SimpsonDescription
The problem is actually in the flaring process itself. When creating an inverted flare on a brake line, the metal is stretched, shrunken, and inverted, and occasionally ridges develop in the flared fitting. Small deformations in the fitting will smooth out when the fitting is tightened into the seat, but sometimes these ridges are too large or the material is too hard to smooth out during normal tightening. This can be especially true when bending stainless brake lines.
One great solution to this problem is brought to us by the folks at Koul Tools, who manufacture a great tool for lapping the ends of the flare fitting to create a smooth positive seal without the need to over-tighten your fittings. We join Mark Simpson in the shop to test out the Koul Tools P-51B Surseat Flare Lapping Tool. This tool allows you to lap-in flared tubing to eliminate leaks in fuel and brake line joints.
This tool works by removing irregularities in the flare and hones it to a perfect angle to enable the tube to seat with the fitting. It’s not only perfect for your newly flared stainless steel, aluminum, or copper lines, but it can also repair the seal with the fitting of an existing brake or fuel line. It is based on the tried and true practice of lapping engine valves. A diamond dust-coated lapping head with a precision 37° or 45° angle literally polishes the flare smooth to perfection. But don’t wait to discover a leak when bleeding your brakes to use this tool when it makes great sense to use it every time you make a flare fitting to ensure a great seal.
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