Aren't I lucky! Ha. These calipers were rebuilt when I got the car in 2014 so I'm hoping nothing's too seized up. I'm particularly thrilled about this since I just rebuilt my servo last month after that drank all my brake fluid. I've used more brake fluid than petrol the last couple months!As for the leak, judging by the wetness there including the handbrake shaft, the culprit is the caliper seal(s). So to look on the bright side, that big nut is often a pain to remove so you've got leg up. lol.
If you do, that'd be wonderful! I can't see it being available anywhere.PS It's possible I have the cap and spring.