The handbrake on my car is too weak. By that I mean that, when I pull the handbrake as hard as I can, it still doesn't brake the car if I park steeply enough. The handbrake lever does, however, still tighten up normally when I pull it, rather than bottom out, so I assume it isn't just that it needs tightening.
It's a BMW E39, so it uses the inside of the rear brake discs as a drum brake for the purposes of the handbrake. However, I've checked the brake shoes, and they seem fine. Checking pictures of new brake shoes, they don't seem to have visibly more lining.
If it isn't the brake wire, and the brake shoes aren't worn, what can it be? Can the brake shoes get "old"?