Honda Supra GTR150 2020 Owner's Manual page 12

Riding Precautions
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Engine Braking
Engine braking helps slow your vehicle down
when you release the throttle. For further slowing
action, downshift to a lower gear. Use engine
braking with intermittent use of the brakes to
reduce speed when descending long, steep
slopes.
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Wet or Rainy Conditions
Road surfaces are slippery when wet, and wet
brakes further reduce braking efficiency.
Exercise extra caution when braking in wet
conditions.
If the brakes get wet, apply the brakes while
riding at low speed to help them dry.
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