TGB Blade 250 ATV Quad Service Repair Manual, Page 163Get this manual
E!a Remove the rubber bootRemove the cir clipRemove the piston and the springClean the master cylinder with recommended brake fluid
14FRONT BRAKEFRONT WHEEL
Cir clip Rubber boot Piston
piston cup
Master cylinder
Master Cylinder Inspection
Check the master cylinder for damage or scratchReplace it if necessaryMeasure the cylinder inner diameter at several points along both and directionsReplace the cylinder if the measured values exceed allowable limitAllowable limit: 14.055 mm