In a decade run they produced little over 100 vehicles, that's barely past a concept vehicle. Most vehicle manufacturers provide more vehicles for safety testing than McLaren likely ever produced of the F1. Oh, and it's almost two-decades old on initial release.
Sure you can. The McLaren F1, for instance -- only the world's fastest production car ever -- had unassisted brakes.
Edited to add link: http://en.wikipedia.org/wiki/McLaren_F1#Brakes