Years ago, your dad might have told you that “pumping” the brake pedal was a good idea on wet or slippery pavement, so you could maintain control of the
vehicle without locking up any of the wheels and sending the car into a skid. Well, that’s some pretty outdated advice today.
Every vehicle now features antilock brakes (ABS), which greatly in vehicle control during an emergency stop. ABS brakes use a sensor at each wheel to monitor the wheel’s rotational speed. That information is then sent to a processor; if any wheel is in danger of going into a skid, the processor meters braking (through a system of pumps and valves) to reduce braking effort to that wheel. This is a cycle that happens hundreds of times per second, with the ABS system essentia ...[more]