I've had 4 fiesta's (2 street, 2 race) and none of them had boosters.
Like Gary says, the brakes can be a bit spongy but after years of fluid/pad combos, what has worked for me is using Motul 600 with the Porterfield R4E pad on the front with 2.5 dia brake hose.... no more sponginess even at Sebring club course.