2009-2010 Polaris RZR Factory Service Manual, Page 311Get this manual
BRAKES FRONT BRAKE DISC
Disc Inspection
12Visually inspect disc for scoring, scratches, or gougesReplace the disc if any deep scratches are evidentUse 0-1" micrometer and measure the disc thickness at eight different points around the pad contact surfaceReplace disc if worn beyond service limit3Remove the hub assembly from the vehicle and remove the (4) bolts retaining the disc to the hub
Clean the wheel hub mating surface and install new disc on wheel hubInstall new bolts and torque to 28 ftlbs(38 Nm)
Brake Disc Thickness New: .188" (4.78 mm) Service Limit: .170" (4.32 mm) Brake Disc Thickness Variance Service Limit .002" (.051 mm) difference between measurements