Just bleed it using a quality fluid as they aren’t all the same a large syringe from you local vet will make it a very fast and easy process. Small length of hose is also required.
I like the Motul fluid, I also have a fluid that I got of lefty and have used it in the Tenere with success. Make sure you use the correct DOT fluid for your bike, check your manual.
Replacing the fluid should be done at least every 12 months and more often if you ride a lot. Check for heat related damage when you pull the pads out, they will need replacing as well really
TB