2007-2009 Kawasaki KFX50 service manual, Page 69Get this manual
3INSPECTIONADJUSTMENT BRAKE FLUID CHANGE
Place the machine on level place and set the handlebar uprightRemove the two screws attaching the brake fluid reservoir capUse shop towels to cover plastic parts and coated surfaces to avoid damage caused by splash of brake fluid
Connect transparent hose to the brake caliper bleed valve and then loosen the bleed valve nutUse syringe to draw the brake fluid out through the hose