Honda FourTrax Foreman TRX500FE2 2018 Owner's Manual page 190

Brakes
Adjustment
RIGHT REAR
(2) brake pedal adjusting nut
(3) brake arm pin
1. Turn the brake pedal adjusting nut (2), located on the brake
operating rod at the rear of the frame. Make sure the cutout on
the adjusting nut is properly seated on the brake arm pin (3).
2. Adjust the freeplay of the rear brake pedal. Push the brake arm
(4), then check the clearance between the brake arm and the
brake arm pin.
(4) brake arm
180
Servicing Your Honda
(3)
(4)
(2)