2000-2003 Honda TRX350 Rancher factory service manual, Page 233Get this manual
BRAKE SYSTEM Do not allow the piston cup lips to turn inside out
Coat the piston and cups with clean brake fluidInstall the piston into the wheel cylinderApply silicone grease to the boot grooves in the piston and cylinder bodyInstall the piston boot onto the cylinder and piston grooves securelyApply silicone grease to the adjuster screw threads and adjuster nut spindle outer surfaceInstall the adjuster into the master cylinder