[singpilot]

I still think the just braking is the shortest distance to stop (what you asked). Performance braking (being ready to accel again prior to stopping) would be to keep the engine revs up (by say... downshifting as well as braking). You could reverse the decel to accel most quickly that way.

Panic stop? Ernest is right. Get the tires to almost locked (keeping steering is a happy by-product here) and maintain that C of F until stopped. ABS systems do that for you with pulsed to lockup, immediate release, pulsed to lockup again, faster that you ever could. Modern ABS systems do it by individual wheels. Some systems do the wheels in pairs. If you were downshifting, and the drag of the downshifted engine, trans and driveline were added to the brake, the ABS (sensing impending lockup at the wheel) would release that brake (and maybe some others *paired* as well) until the traction spun the locking wheel (and it's speed sensor) up again. If the downshift wasn't going to allow that, you might be in for a surprise.

I am using my experience in being in full anti-skid once a week (typically) as a guide here. Stopping 50 tons of airplane on a wet or snowy runway gets you lots of ABS experience. Throw in slowing thru the hydroplaning speed, and a full stop has some interesting moments.