2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 234Get this manual
HYDRAULIC DISC BRAKE ASSEMBLY
MA'H'R PISTON
PIVOT BOLT
PIVOT NUT
BRAKE LEVER
Coat the master piston and piston cups with clean brake fluidInstall the spring onto the mast er pistonDo not allow the Install the spri ng and mast er piston into he master piston cup lips to cylindertum InsldB out,