E61 Wagon Rear Brake Lines for M5 Caliper UpgradeDescription We had these custom lines made to correctly fit the E61 with the rear M5 caliper upgrade. These lines will allow for better clearance to the rear shocks and will not rub like the standard style rear brake line. 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