2004-2005 Honda TRX450R Factory Sevice Manual, Page 67Get this manual
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REAR BRAKE
Pllce th vehic lelevel surlaC!Ch""k h" !Iu ,d le vel inhe ,ca b,a" ,vo;II the le vel i"""' he "LO WE R" 1""1 Ii"", 'em lhe ynt,n! bol' rtSlrvoir caP, and iaphragm nd fill ,he 'O'$Crvoi' ,h OOT b'ola fluid from cont in'" to 'he 'UPPER"