Polaris Outlaw 450 MXR LE Owner's Manual page 160

Brakes
1. Always maintain brake fluid at the recommended level. See
pages 60-61.
2. Check the brake system for fluid leaks.
3. Check the brakes for excessive travel or spongy feel.
4. Check the friction pads for wear, damage and looseness.
5. Check the security and surface condition of the disc.
6. Inspect the rear brake disc spline and pad wear surface for
excessive wear.
NOTE:
Pads should be changed when worn to 3/64" (1 mm).
Maintenance
3/64" (1 mm)
157