2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 185Get this manual
BRAKES 6Install new disc on hub
= In mmBrake Disc Thickness New: .157" (4.0 mm) Service Limit: .140" (3.56 mm) 7
CAUTION
Always use new brake disc mounting boltsThe bolts have preapplied locking agent which is destroyed upon removalInstall new bolts and tighten to specified torque18 ftlbs(24 Nm)
= In mmBrake Disc Thickness Variance Service Limit: .002" (.051 mm) (difference between measurements) 3Mount dial indicator as shown and measure disc runoutSlowly rotate the disc and read total runout on the dial indicatorReplace the disc if runout exceeds specifications
Rear Brake Disc Shown