Quote: My understanding of the reason for wrapping the steel line is to protect the tubing from mechanical damage. That includes rocks, flat tires and wrenches.
That is part of it. The coil also provides a vibration dampening along the unsupported distance to the brake backing plate. Prior owner of my jeep had replaced one of the rear brake line sections and didn't salvage the coil. About 6 years later, that line had cracked where the flare nut bolts into the backing plate. Compounding the problem, the clamp that should have held the line secure to the axle was loose due to the lack of the coil allowing the entire line to vibrate.
So, the main intent of the coil may be for line protection, however, it does serve another important function along with the clamps that hold the line in place.
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