Yamaha YZ250FM 2021 Owner's Service Manual

CHASSIS3-24can indicate the presence of air in the brakesystem. Before running, bleed the brake sys-tem. Air in the brake system will cause brak-ing performance to be reduced.NOTICEECA13510After adjusting the brake pedal position,make sure there is no brake drag.EAM30234CHECKING THE BRAKE FLUID LEVEL1. Stand the vehicle upright on a level surface.TIPIn order to ensure a correct reading of the brakefluid level, make sure that the top of the brakefluid reservoir is horizontal.2. Check:• Brake fluid levelThe minimum level mark “a” or below  Add.WARNINGEWA13090• Use only the designated brake fluid. Otherbrake fluids may cause the rubber seals todeteriorate, causing leakage and poorbrake performance.• Refill with the same type of brake fluid thatis already in the system. Mixing brake fluidsmay result in a harmful chemical reaction,leading to poor brake performance.• When refilling, be careful that water doesnot enter the brake fluid reservoir. Waterwill significantly lower the boiling point ofthe brake fluid and could cause vapor lock.NOTICEECA13540Brake fluid may damage painted surfacesand plastic parts. Therefore, always clean upany spilt brake fluid immediately.EAM30231CHECKING THE FRONT BRAKE PADSThe following procedure applies to all of thebrake pads.1. Operate the brake.2. Check:• Front brake padWear indicator grooves “1” almost touch thebrake disc  Replace the brake pads as aset.Refer to “FRONT BRAKE” on page 4-13.EAM30232CHECKING THE REAR BRAKE PADSThe following procedure applies to all of thebrake pads.1. Operate the brake.2. Check:• Rear brake padWear indicator grooves “1” almost disap-peared  Replace the brake pads as a set.Refer to “REAR BRAKE” on page 4-24.EAM30478CHECKING THE FRONT BRAKE HOSE1. Check:• Brake hoseCracks/damage/wear  Replace.2. Check:• Brake hose clampLoose connection  Tighten the clamp bolt.3. Stand the vehicle upright and apply the frontSpecified brake fluidDOT 4A. Front brakeB. Rear brakeaaa11