2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 108Get this manual
CHECKING THE BRAKE HOSES BLEEDING THE HYDRAULIC BRAKE SYSTEM 1 1
2Check: front brake hoses rear brake hose Cracksweardamage Replace3Check: brake hose clamps Loosen Tighten4Hold the machine in an upright position and apply the front or rear brake5Check: brake hoses Apply the brake lever or brake pedal several timesFluid leakage Replace the hosesRefer to "FRONT AND REAR BRAKES" in chapter 76Install: front fender side covers (left and right) fuel tank cover seat Refer to "SEAT, FENDERS AND FUEL TANK"