3/16 is usually for Disc brake and 1/4 usually for drum. The 3/16 line should use a 3/8-24 threaded tube nut and the 1/4" a 7/16-20 threaded tube nut


Dave Chapman
The Hollister Road Company
713-937-0387
[email protected]
www.hollisterroad.com
www.thoroco.com