[Landseer]

I've had them not pump-up.

The way that solve it for me was bleeding it into a towel in the car. It will spurt the fluid, so protect the inside of the car and yourself.

Basically, remove the clutch actuation rod. Remove the retaining clip for the master piston. With one strong finger always on the piston, ease it into the car until it burps air and then fluid, quick push it back into the bore, and replace the clip and rod.

This way always works on mine, same brand, new, as yours.