@RoryAlsop - Here's one for you! Enjoy :o)

@NarimanAsgharian We took it to Hyundai to get it figured out. And they said that they think it is the booster and master cylinder. Some parts have been ordered and they will come in sometime next week or the week after. And then by that time I should have some more information for you.

Master cylinder is $700 and the booster is $400. It is all one part but cost is per part number.

Hyundai also said that it will need a vacuume seal on the booster I think. If I remember properly.

More so a re vacuume