My rear brake pads lies slightly against the disc. Anyone knows how I can adjust this?

I've tried to adjust it the same way as on my fathers GSX-R 1000 k3, but it doesn't react on the adjustment. What can I possibly do wrong? There's no problem to loosen the lock nut, but when we are screwing on the pushrod the only thing that happens is that the pushrod nut, or what it's called, moves on the threaded rod. It doesn't affect the pads on the disc.

It can't be adjusted, the only thing you can do is clean/reseal the caliper and this should sort your problems.