TM 9-2320-209-20-3-2 b. Replacement. (1) Hydraulic lines and clamps. CAUTION Fittings are made of soft brass. They can be stripped very easily if tightened too much. Tighten fittings just enough to stop fluid from leaking. NOTE Hydraulic brake line on left rear axle is used for this typical procedure. FRAME 1 1. Using 9/16-inch open end wrench, hold multiple connector (1). Using 7/16- inch combination box and open end box wrench, screw in and tighten tube nut (2). GO TO FRAME 2 13-97