Shimano GRX RX 815 Series Dealer's Manual page 109

INSTALLATION/REMOVAL
Installing the brake hose
3.
Remove the seal plug.
Cover the seal plug with a waste cloth while conducting this procedure as oil that has
adhered to the seal plug may leak.
4.
Insert the brake hose in the brake hose connection port.
It comes with a built-in olive. Insert the hose so that it does not become snagged on the
olive.
Insert the hose until the check marks on the surface of the hose are covered.
Cover with a waste cloth while conducting this procedure as some of the internal oil may
leak.
.
Seal plug
109