Yamaha KODIAK ULTRAMATIC YFM400FA Owner's Manual page 228

If your ATV has stalled or stopped and you be-
lieve you can continue up the hill, restart care-
fully to make sure you do not lift the front
wheels which could cause you to lose control.
If you are unable to continue up the hill, dis-
mount the ATV on the uphill side. Physically
turn the ATV around and then descend the hill.
If you start to roll backwards, DO NOT apply ei-
ther brake abruptly. If you are in 2WD, apply
only the front brake. When this ATV is in 4WD,
all wheels (front and rear) are interconnected
by the drive train. This means that applying ei-
ther the front brake or the rear brake will brake
all wheels. When descending hills, using either
brake lever or the brake pedal will brake the
wheels on the downhill side. Avoid sudden ap-
plication of either the front or rear brake be-
cause the wheels on the uphill side could come
off the ground. The ATV could easily tip over
backwards. Apply both the front and rear
brakes gradually, or dismount the ATV imme-
diately on the uphill side.
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