1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 166Get this manual
BRAKES Measure the master cylinder piston .0
SERVICE LIMIT: 12.645 mm fO.4978 In l
Check the primary and secondary cups for damage before assembly
MASTER CYLINDER ASSEMBLY
CAUTION
Replace rhe masler cylinder piston, cylinder and spring as set; don 'I substilute individual pariSAssemble the master cylinderCoat aU parts with clean brake fluid before assemblyInstall he spring and primary up togetherDip the secondary cup in brake ftuid before assembly Install the pistonsnap ring and boot CAUTION
15SECONDARY CUP )' (2) DIAPHRAGM
When installing the cups, do not allow the ips 0 turn inside oul and IN cerlain the snap ring isjirmly seated in the
Place the master cylinder on the handlebarInstall the master cylinder holder with the UP mark facing up Tighten the upper screw firstthen tighten the lower screw looselyAlign the end of the throttle housing with the punch mark on the handlebarAlign the end of the master ylinder holder with the line of the throttle housing Tighten the screwsInstall the brake hose with the bolt and two sealing washers