Yes, in a front-drive car the brake pedal applies braking force to all four wheels, whereas the parking brake is only connected tot he rear wheels. Yes, in a front drive, most of the braking is handle by the front wheels. I believe there are devices that adjust the distribution of braking poer, but they are pretty costly. Road racers and autocrossers benefit from adjusting their braking system balance. On rear-drive cars, the parking brake usually controls the front brakes, which explains a standing burnout on an FR. Yes, if you engage the parking brake on an FF, it will hold the car still while spinning the front wheels.