Yamaha YZ250FM 2021 Owner's Service Manual

FRONT BRAKE4-21Refer to “BLEEDING THE HYDRAULICBRAKE SYSTEM” on page 3-25.6. Check:• Brake fluid levelThe minimum level mark or below  Add.Refer to “CHECKING THE BRAKE FLUIDLEVEL” on page 3-24.7. Check:• Brake lever operationA softy or spongy feeling  Bleed the brakesystem.Refer to “BLEEDING THE HYDRAULICBRAKE SYSTEM” on page 3-25.EAM30036REMOVING THE FRONT BRAKE MASTERCYLINDERTIPBefore removing the front brake master cylinder,drain the brake fluid from the entire brake sys-tem.1. Remove:• Union bolt• Copper washer• Brake hoseTIPTo drain any remaining brake fluid, place a con-tainer under the master cylinder and the end ofthe brake hose.EAM30037CHECKING THE FRONT BRAKE MASTERCYLINDER1. Check:• Brake master cylinder “1”Damage/scratches/wear  Replace.• Brake fluid delivery passages “2”(brake master cylinder body)Obstruction  Blow out with compressed air.2. Check:• Brake master cylinder kitDamage/scratches/wear  Replace.3. Check:• Brake master cylinder reservoir cap4. Check:• Brake hoseCracks/damage/wear  Replace.EAM30038ASSEMBLING THE FRONT BRAKE MASTERCYLINDERWARNINGEWA13520• Before installation, all internal brake com-ponents should be cleaned and lubricatedwith clean or new brake fluid.• Never use solvents on internal brake com-ponents.1. Wash the brake master cylinder and thebrake master cylinder kit with brake fluid.2. Install:• Primary cylinder cup “1”• Secondary cylinder cup “2”(to the brake master cylinder piston “3”)WARNINGEWA20240Apply brake fluid to the cylinder cups and in-stall them as shown. Wrong orientation in in-stallation causes poor braking performance.3. Install:• Spring “1”12Specified brake fluidDOT 41 23213