My guess is that you did not have anti-lock - but the brakes still worked OK.
If you just applied the brakes, not pumping or brake and release, the vacuum booster may still have been available. And even if the vacuum was depleted, the brakes will still function, you just have to mash the pedal harder.
Did you manage to modulate the brakes and not lose control? Again, I would guess that everything worked out OK. Or I hope that it did.

Regards,