uh, the static coefficient of friction only has to do with surfaces that are not moving with respect to each other.

the only time your tyres experience static friction is when you're stopped.

when you brake, if the wheels are turning your stopping power is coming from rolling friction (which is a kinetic friction). if they're locked, you've got sliding friction (which is also kinetic friction). sliding friction almost always has a greater coefficient than rolling.

i agree that in most cases "locking up" is a dumb way to stop. but it's not because of the amount of force you can apply - it's because of the lack of control you have in how that force is applied.