Yamaha WR250F Owner's Service Manual

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Contents

FRONT BRAKE5-18b. Remove the brake caliper piston dust sealand the brake caliper piston seal.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲EAS2GB2174CHECKING 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 cali-per assembly.• Brake caliper body “3”Cracks/damage  Replace the brake cali-per assembly.• Brake fluid delivery passages(brake caliper body)Obstruction  Blow out with compressedair.EWAWARNINGWhen the brake caliper is disassembled, re-place the brake caliper piston seal and thebrake caliper piston dust seal with newones.2. Check:• Brake caliper bracketCrack/damage  Replace.EAS2GB2175ASSEMBLING THE FRONT BRAKE CALI-PEREWAWARNING• Before installation, clean and lubricate theinternal parts. Use new brake fluid forcleaning and lubricating.• Never use solvents on internal brake com-ponents as they will cause the piston sealsto swell and distort.• When the brake caliper is disassembled,replace the brake caliper piston seal andthe brake caliper piston dust seal with newones.EAS2GB2176INSTALLING THE BRAKE CALIPER PISTON1. Clean:• Brake caliper• Brake caliper piston seal• Brake caliper piston dust seal• Brake caliper pistonUse brake fluid for cleaning.2. Install:• Brake caliper piston seals “1”• Brake caliper piston dust seal “2”EWAWARNINGAlways use new brake caliper piston sealand brake caliper piston dust seal.TIP• Apply the silicone grease on the brake caliperpiston seal and brake caliper piston dust seal.• Fit the brake caliper piston seal and the brakecaliper piston dust seal into the grooves in thebrake caliper correctly.21 13Recommended brake fluidDOT 4NewNew1122