Honda FourTrax Rubicon TRX520FA5 2020 Owner's Manual page 61

To apply the parking brake:
Bring the vehicle to a complete stop, then make sure the
transmission is in neutral.
Squeeze the rear brake lever/parking brake lever (1), then rotate the
parking brake lock lever (2) clockwise until it engages the slot on the
rear brake lever/parking brake lever bracket.
For more information on Parking, see page 115.
(2)
(1)
(1) rear brake lever/parking brake lever
(2) parking brake lock lever
To release the parking brake:
Squeeze the rear brake lever/parking brake lever until the parking
brake lock lever is released from the slot on the rear brake lever/
parking brake lever bracket.
The brake light is activated by applying the parking brake. When
using the parking brake, be sure turn the ignition switch to OFF (w)
to avoid discharging the battery.
Controls & Features
Instruments & Controls 51