Yamaha BIG BEAR 400 Owner's Manual page 83

If you begin rolling backwards:
G
Keep weight uphill.
G 2WD: Never apply the rear brake while roll-
ing backwards. Apply the front brake.
When fully stopped, apply the rear brake
as well, and then lock the parking brake.
G
4WD or 4WD-LOCK: Apply both front and
rear brakes gradually. When fully stopped,
lock the parking brake.
Dismount on uphill side or to a side if point-
ed straight uphill. Turn the ATV around and
remount, following the procedure described
in the Owner's Manual.
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