2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 61Get this manual
MAINTENANCE REAR BRAKE:
Remove the '8aUrear fender ipage 2-41Place the vehicle on II level surfaceCheek Ihe rear brake flu id reservo ir leve lIf the level is near the lower level line, check the brake pad wear (page 3-18)
FLUID FILLING
FRONT: Remove the handlebar cover (page 2-8)