Tost Disk Brake rebuild?

I discovered that my Nimbus 3D had lost it's wheel brake Saturday.
Fortunately, I still fly with the assumption that it, like many
gliders of the past don't have wheel brakes. No damage done other
than a Long push back to the tiedown area.

Upon examination of the system, (and the puddle) it appears that it's
time for a rebuild of the caliper. Who's got some advice on the
process? Any tricks??

Thanks for the advice in advance

Paul
Ephrata, WA