Farhad,
There is only one reservoir. (Two if you want to get technical, one front, one rear) The plastic cup that holds the fluid. You will need to keep this. The reservoir holds excess fluid that is drawn out when you force (compress) the fluid into the calipers. The reservoir does hold much more fluid than it really needs to, but it does to prevent a complete failure.
I believe what Bruce was talking about was further down the brake line. From his explanation Kawi's have a single brake line going from the master cylinder (right after the brake level) down to a crossover manifold, which splits the single line into two (One for each caliper).
Correct me if I'm wrong?
I've got two SS lines coming from my master cylinder to each caliper.
The only change you'll notice with SS or Kevlar lines is that the brakes will come on firmer and never fade. Grabbing a handful of front brakes with SS lines in the wrong situation may be worse than having rubber lines.. so make sure you're comfortable with emergency braking before you goto SS lines.
Jim.