Thanks for the solution Bo, I was wondering about this my self. Just completed the swap. Didnt grab much in my case either, but I figured that because I haven't added brake fluid and flushed it yet. I kinda thought it was going to be a "mechanical" function, like the stock s30 cars, but according to my cousin with an s13, he claims it needs to be properly bleed to work. Kinda got me wondering, what if there is a leak? Does that mean the hand brake fails? I don't have an answer. Just thinking out loud.
Also did you use the Modern motorsports 240sx rear caliper kit to complete your conversion? If so, where did you put the supplied washer? Between the bracket and the caliper, or between the bolt and caliper? Reason I ask, is because the rotor doesn't seem centered on my car.