Honda CB Unicorn 160 Owner's Manual page 28

4. Apply the brake several times and
check for free wheel rotation after the
brake pedal is released.
If proper adjustment cannot be obtained
by this method, see your Honda dealer.
After adjustment, push the brake arm to
confirm that there is a gap between the
rear brake adjusting nut and the brake arm
pin.
After adjustment, confirm the free play of
the brake pedal.
Gap
Cut out
correctly seated
Cut out not
seated
22
Other Checks:
Make sure the brake arm, spring and
fasteners are in good condition.