miata brake failure

So after an autox this weekend, i was changing wheels to find the inside of my driver's rear completely coated in a nice spray of brake fluid :O I have to pull the caliper to get a better look but it appeared to be coming from somewhere around the emergency brake cable. Am I better off trying to rebuilding the caliper or just replacing it? And the best option for getting this fixed before the next autox on Saturday?

1st question: is it the hose or caliper that failed? The last time I tried to find a rebuild kit for a Miata caliper, I could only find one, and it was $5 less than a rebuilt unit. Wasn't worth my time to rebuild it myself. ust make sure that it's the caliper and not the hose, I've seen the hoses come lose and leak.