Honda CRF150F Owner's Manual page 126

Make sure the cut-out on the adjusting nut is
seated on the brake arm pin (5) after making
final free play adjustment.
If proper adjustment cannot be obtained by
this method, see your Honda dealer.
5. Apply the brake several times and check
for free wheel rotation after the brake
pedal is released.
(4)
(A)
(B)
(4) Adjusting nut
(5) Arm pin
(5)
(A) Decrease free play
(B) Increase free play
Other Checks:
Make sure the brake rod, brake arm, spring
and fasteners are in good condition.
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