How to bleed your disc brakes?
As with the fork, annual maintenance of your brakes is recommended. Beware, however, that suitable equipment and skills are required for this operation!
Required tools: Bleed kit / Torx spanner / 6 mm open-end spanner / brake fluid recommended by the brand
Unscrew the lever bleed screw with a Torx spanner and place a cloth on the side of the handlebar to absorb any fluid leaks.
Screw an empty syringe in place of the bleed screw. Remove the pads from the caliper and replace them with a shim.
Remove the syringes, then re-install the bleed screws on the lever and caliper and replace the brake pads.