A great racing adage is "Brakes slow you down". Its very true. In most cases amature advanced drivers use brakes far too hard and far to often and thus slow themselves down. My suggestion is to have a good instructor be with you to see how your momentum be curtailed as little as possible. The ST is a momentum car and can be made to rotate as opposed to slowed down with brakes. Just my thoughts.
p.s. I do about 12 to 15 track days a year
Brack Driving Concepts
Focus ST (Mk III) with Cobb Intercooler, K&N Typhoon Air Intake, Cobb Accessport V2, Godrich Braided Brake Lines, Stoptec Rotors, Hawk HP10 brake pads, Audi factory racing Brake Fluid, Mishimoto Rad, Eichbach Sport Springs, Continental DW Extreme tires, NGK Race Plugs