2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 47Get this manual
MAINTENANCE Brake Pad Inspection
Pads should be changed when the friction material is worn to .180"4.6 mm, or about the thickness of dime
Auxiliary Brake Testing
The auxiliary brake should be checked for proper function
Auxiliary Brake
.180"4.6 mm,
Minimum Thickness