Yamaha YZ250X 2022 Owner's Service Manual

FRONT BRAKE4-174. Check:• Brake fluid levelRefer to “CHECKING THE BRAKE FLUIDLEVEL” on page 3-14.5. Check:• Brake lever operationA softy or spongy feeling  Bleed the brakesystem.Refer to “BLEEDING THE HYDRAULICBRAKE SYSTEM” on page 3-15.EAM30030REMOVING THE FRONT BRAKE CALIPERTIPBefore disassembling the brake caliper, drainthe brake fluid from the entire brake system.1. Remove:• Union bolt• Copper washer• Brake hoseTIPPut the end of the brake hose into a containerand pump out the brake fluid.EAM30031DISASSEMBLING THE FRONT BRAKECALIPER1. Remove:• Brake caliper piston “1”• Brake caliper piston dust seal “2”• Brake caliper piston seal “3”a. Blow compressed air into the brake hosejoint opening to force out the piston fromthe brake caliper.WARNINGEWA13550• Cover the brake caliper piston with a rag.Be careful not to get injured when the pis-ton is expelled from the brake caliper.• Never try to pry out the brake caliper pis-ton.b. Remove the brake caliper piston dust sealand the brake caliper piston seal.EAM30032CHECKING THE FRONT BRAKE CALIPER1. Check:• Brake caliper piston “1”Rust/scratches/wear  Replace the brakecaliper piston.• Brake caliper cylinder “2”Scratches/wear  Replace the brake caliperassembly.• Brake caliper body “3”Cracks/damage  Replace the brake caliperassembly.• Brake fluid delivery passages(brake caliper body)Obstruction  Blow out with compressed air.WARNINGEWA19220When the brake caliper is disassembled, re-place the brake caliper piston seal and thebrake caliper piston dust seal with new ones.2. Check:• Brake caliper bracketCrack/damage  Replace.EAM30033ASSEMBLING THE FRONT BRAKE CALIPERWARNINGEWA19230• Before installation, clean and lubricate theinternal parts. Use new brake fluid for31221 13