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Brake lines must be steel, steel braided, or
DOT-approved flexible and routed outside the framerail, or enclosed in
a 16-inch length of 1/8-inch minimum wall thickness steel tubing
securely mounted where line(s) pass the flywheel bellhousing area
and not routed in the driveline tunnel. All brake lines must be attached
to chassis as per OEM style; hoses must have mounting brackets; no
tie wraps, tape, etc.

from nhra rule book