2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 268Get this manual
HYDRAULIC DISC BRAKE snap ring TOOL: Snap ring pliers
07914-SASOOOl
master piston piston spring
Clean the master cy linderreservoi and maste piston in clean rake luid
INSPECTION
Check the master cylinder and master piston for scoringscratches or damageCheck the piston cups for weardeteriorat ion or damage