2001-2003 Honda TRX500FA Factory Service Manual, Page 66Get this manual
MAINTENANCE NOTE: hen the fluid leve is low, check entire system fo RESERVOIR CA P
leaksTur the handlebar th left side so th at the reservo is level and chec th brak reserv oi leve th rough the sight glassIf th level is near the "LOW ER" level line, remove the reservoi cap, set plate and di aphragmand fill the reservo ir with DOT DOT brak fluid fro sealed co nt ainer th casti ng ledgeInstall he di aph ragmset pla te and reserv ir cap and tigh ten the cap scr ews