2011 Polaris Ranger RZR ATV Service Manual, Page 337Get this manual
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BRAKES Caliper Inspection
= In mmRZRRZR S: Front Caliper Piston Bore I.D Std: 1.004" (25.5 mm) Service Limit: 1.006" (25.55 mm)
= In mmRZR 4: Front Caliper Piston Bore I.D Std: 1.37