C.A.T. Compact Adult Tricycle Owner's Manual page 12

As you hold onto the handlebars
with both hands, you will control the
throttle with your right thumb.
Depress the throttle to increase your
speed. Be careful to slightly push
the throttle until you are accustomed
to its sensitivity. As you push the
throttle, your speed will increase.
To stop your C.A.T., disengage the
throttle and apply pressure to the
handbrake.
If you are parking your scooter on
an incline, engage the handy
parking brake by tightly holding the
hand brake and pushing the
parking brake into the hole so the
handbrake remains engaged.
When parking the scooter, always
push the power switch off and turn
the key to the off position. Be sure
to remove the key to keep
unauthorized persons from using
the C.A.T..
In order to adjust the sensitivity of the
hand brake, either tighten or loosen
the wire shown on the left. First
loosen the nut and then push the wire
back toward the brake to lessen
sensitivity, or pull the wire to increase
sensitivity.