Early CJs have the hard lines on the axle. FSJ brake lines go to the frame. We started with '77 Wagoneer calipers and factory rubber lines on our FSJ. In some cases you will need longer brake lines and it's a good time to upgrade. Skyjacker offers longer, high quality, stainless steel braided brake lines for nearly any Jeep. Part number FBL41 works with '74-'91 FSJ calipers. They are long enough to reach the frame on lifted Jeeps, including our '73 J2000, and have 3/8-inch hard line fittings that fit most early Jeeps.