2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 97Get this manual
AIR BLEEDING (HYDRAULIC BRAKE SYSTEM) INSP ADJ
bInstall the diaphragmBe careful not to spill any fluid or allow the reservoir to overflowcConnect the clear plastic hose tightly to the caliper bleed screw Front Rear
dPlace the other end of the hose into containereSlowly apply the brake lever or pedal several timesfPull the lever in or push down on the pedal and hold itgLoosen the bleed screw and allow the lever or pedal to travel towards its limithTighten the bleed screw when the lever or pedal limit has been reached, then release the lever or pedaliRepeat steps (e) to (h) until all the air bubbles have disappeared from the fluidjTighten the bleed screwBleed screw: Nm (0.6 kg, 4.3 ft lb)