Mine is mounted near the spar on my 7A. It can be easily reached with your right hand and no linkage is required.
More pictures and text involving my parking brake valve install at:
P.S. I was happy that I went to the trouble to install the parking brake. I haven't been flying a complete year yet, but I gotten myself into several situations where the brake was indispensable. (Like not being able to get out of the plane after parking without the plane rolling.)