Fortunately the first one I replaced was under warranty and so Is this one
The brake system has Brembo dot 4 fluid
It's definitely leaking from around the piston the rubber boot is wet and not the brake hose / the connection.
As it is a repeat on the same side with the leak from the exact same component of the calliper I am wondering if there could be underlying issue isolated to purely the NSF?
In general the car brakes exactly as it should