2007-2010 Honda FourTrax Rancher 420 TRX420 TRX Service Manual, Page 378Get this manual
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BRAKE SYSTEM Measure the master cyl inder 1.0SERV ICE LIMIT: 14.055 mm (0 .5533 in )
PIVOT PISTON BOOT SPACER
SWITCHES
BRAKE LEVER
Do not allow the piston