I would recommend that you not only research the forces required but much more importantly, HOW an F1 driver would apply them. As turbof1 points out, this is a peak value, but a believable one: most men would be able to stand with a 100kg deadlift on their back, which admittedly is through two legs, but an athlete could be expected to peak 175kg in one leg no problem.
Anyway, as I was saying, given you are applying your research to F1, I cannot emphasise enough how important it is that you consider driver technique. With an aero-heavy car the general technique is a large force which trails off as you turn in (unsurprisingly known as "trail braking"). This is done for three reasons: 1) at the point just before you break the car is travelling at its fastest speed, and so it is generating maximum downforce, therefore the tyres are capable of sustaining the maximum braking load 2) the tyres are limited by a g-force circle (or more accurately, oval) which limits the force they can supply at any one time, and so to maximise cornering loads you need to make sure that you aren't braking or accelerating at that time 3) braking hard loads the front tyres and helps with turn in. Much of this you may already be aware of, but make sure you put two and two together and look at a good few telemetry graphs when doing your research, it should allow you to form a function of braking force with time. You won't find any new ones for F1, but I wouldn't be surprised if a cheeky photo of an F3 one were kicking about somewhere, and those car produce similar downforce and similar driving styles to F1.
There we are, found some for you:
http://i14.photobucket.com/albums/a308/ ... emetry.png
Obviously beware believing it too much, it looks like its some sort of simulator from their website, but it shows you braking trails nicely.
. I need as much information as I can about the discs themselves. So any good book, pdf, paper or information you guys could give me would be much appriciated. 
