I'm going through this now with my 07 s. Did a brake job all the way around, rear shoes/ drums were crusty but brand new, never adjusted when replaced (I used my new parts and saved the old unused drums and shoes). After adjusting rear drums where i like them I still had no ebrake so I pulled my dash apart (put in my $200 boss android auto headunit ran backup camera wire). Turns out my cable is maxed out on adjustment so time to replace.
To elaborate on the adjustment a little more (after rear brakes are adjusted properly)
1) un thread shift know, place to side
2) lift up on shifter boot bezel, place to side
3) 2 10 mm bolts at bottem of armrest console storage need to be removed
3) 2 Phillips screws under center stack console storage need to be removed (I shouldn't have to say this but just incase. NO POWER TOOLS!
4) pull ebrake handle up and pull full center console up and out (preferably on grass next to car completely out of the way.) Be aware your 12 volt access point needs to be disconnected, it simply pulls out
5) release ebrake
6)with 2 10mm box wrenches (preferably at least 1 shorty) break loose the jamb nut on ebrake cable, and thread nut up a bunch of threads.
7)tighten down lower nut (a little at a time, checking handbrake tension as you go)
8)leave everything off thread knob on and test ebrake, adjust as needed.
9) put it all back together (don't try and kill the jamb nut )
Good luck
Ohh tools needs are
10mm socket (1/4" drive preferably)
2 10mm box wrenches (ideally shorties)
And Phillips screwdriver (NOT AN IMPACT GUN, OR DRILL)