Stab braking should only be used `_________`.

A On vehicles without anti-lock systems.

explanation

Stab braking:
Use only on vehicles without anti-lock systems.
Apply the brake all the way.
Release the brakes when the wheels lock up.
As soon as the wheels start rolling, put on the brakes fully again. (It can take up to 1 second for the wheels to start rolling after you release the brakes. If you reapply the brakes before the wheels start rolling, the vehicle will not straighten out.)