Kidding myself I know but don’t really want to send my new brakes back before even riding them. Fittes my new X0 trails today only to see small amounts of fluid surround the piston when the lever is pulled. The brake feels fine with a firm lever feel.
Send it back?
video
It’s the top left piston on the video

Can’t really tell from the video but if it’s fluid leaking it won’t be long before they don’t work properly. Only thing it could be is some fluid this side of the seals from assembly. I’d do a few more squeezes and be ready to send them back. It’s why you buy new rather than used.