Eton ATV RXL 50 Service Manual page 49

Unscrew the bolt and drain out the used oil drain.
Fasten the bolt after the used oil being drained out
completely.
(Dot 3 or Dot 4)
Add the brake oil
Keep oil level at least half of the cup to avoid
air gets into brake system, such like caliper and tube
Unscrew the bolt to vent air from brake system.
Fasten the bolt if there isn't any air in
the brake system.
Pull left brake lever slightly to extract air from
brake system
48