2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 109Get this manual
BLEEDING THE HYDRAULIC BRAKE SYSTEM CHK ADJ
NOTE: Be careful not to spill any brake fluid or allow the brake master cylinder reservoir or brake fluid reservoir to overflow When bleeding the hydraulic brake system, make sure there is always enough brake fluid before applying the brakeIgnoring this precaution could allow air to enter the hydraulic brake system, considerably lengthening the bleeding procedure If bleeding is difficult, it may be necessary to let the brake fluid settle for few hoursRepeat the bleeding procedure when the tiny bubbles in the hose have disappeared
1Bleed: hydraulic brake system
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