So I?ve been rebuilding my parking brake, and got new cables and pads. But I don?t think these
pads have the proper angle on them to grip the discs in the rear. I?ve installed them and spent three days trying to get them to securely hold the weight of the car, and they just won?t.

Do I need to machine them myself? I see lots of blog/forum posts talking about needing to sand material off which is why I bought them from Houston instead of a local parts store; I hope they won?t need that? But if they do, I don?t see any detailed instructions to get the right angle. Anyone know how/where to look?