Honda FourTrax Rancher TRX420FE1 2019 Owner's Manual page 179

Draining Water from Brakes
Refer to Safety Precautions on page 101.
RIGHT REAR
(1)
(1) rear brake drain bolt
1. Make sure the engine is OFF and the parking brake is set.
2. Remove the rear brake drain bolt (1) and sealing washer from the
bottom of the rear brake panel.
If any water drains, the brake seals must be replaced by your
dealer as soon as possible.
3. Install the rear brake drain bolt with a new sealing washer and
tighten it to the specified torque:
9 lbf·ft (12 N·m , 1.2 kgf·m)
Brakes
Servicing Your Honda 169