1999-2004 Honda TRX400EX FourTrax Service Manual, Page 206Get this manual
HYDRAULIC DISC BRAKE Coat the master piston and piston cups with clean brake fluidInstall the spring onto the master pistonInstall the sorina and master Diston into the master cylinderI
CAUTION:
Do not allow the oiston CUD lim to turn inside out
Install the snap ring into the groove in the master cylinder, using the special tool
TOOL Snap ring pliers CAUTION:
07914 SA50001
Be certain the snap ring is firmly seated in the grooveInstall the boot into the master cylinder and the groove in the pistonApply silicone grease to the brake lever contacting surface of the pistonApply silicone grease to the brake lever pivotInstall the brake lever and pivot bolt, and tighten it