Honda PCX 150 Owner's Manual page 255

Brakes Adjusting the Rear Brake Lever Freeplay
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Adjusting the Rear Brake Lever
Freeplay
Adjust the freeplay of the brake lever with the
front wheel pointed straight ahead.
Make sure the cut-out on the adjusting nut is
seated on the brake arm pin when adjusting
the freeplay.
Brake arm pin
98
Adjusting nut
If proper adjustment cannot be obtained by
this method, see your dealer.