2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 317Get this manual
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BRAKES 9 Measure the inside diameter of the rear caliperThe caliper body is 2-step pistonThe rear step is measured as well as the outside step
= In mmRear Caliper Piston Bore I.DInner Bor