Bleeding new calipers

[newkid]

Hi fitted new front calipers (old type with two pistons) and noticed they have two bleed nipples, do both have to be bleed and if so in which order.

Thanks

[CovKid]

I've only ever used one (either) for general bleeding but having two sometimes helps expel air if the system is completely empty/dry - ie when first fitting. Just bleed using one to start with then perhaps on final bleed, use the other to drive out any trapped air.

[bigherb]

Bleed from the lower one first until fluid emerges then bleed the air from the top one. You can just use the top one the lower one is mainly for brake fluid changing.