Z3M BBK Stainless Rear Brake LinesDescription We had these custom lines made to properly reach the rear Porsche Brembo caliper when installed on the Z3M BMW. Our custom brake lines have a fitting that attaches to the caliper. You then attach the swivel fitting on the brake line to the fitting on the caliper. This eliminates the hassle of spinning the caliper onto the brake line and hoping it doesn't end up twisting the line once in position. *Price is for one pair of rear lines. DOT