My experience with the rear SSBC stuff is that it was a pile o' crap. Garbage. The stock parking brake cables ended up being 2" too short, despite SSBC's claims that they would work. Had to order custom cables. Didn't have the greatest of luck with the front kit, either. I won't use their products again. That's just me, though.
I swapped out everything for a 4-wheel Wilwood setup, & couldn't be happier with the braking performance. The rears were a little tricky to dial in the parking brake, but once set up it works great.