Polaris RANGER XP 1000 2021 Owner's Manual page 148

MAINTENANCE
BRAKE LIGHTS
When the brake pedal is depressed, the brake light comes on. Check the brake
light before each ride.
To check the brake lights, do the following:
1. Turn the key to the ON position.
2. Depress the brake pedal. The brake light should come on after about 10mm
(0.4 in.) of pedal travel. If the light doesn't come on, check the bulb.
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