when does anti lock brakes start to work
Anti-lock braking system Typically ABS includes a central electronic control unit (ECU), four wheel speed sensors, and at least two hydraulic valves within the brake hydraulics. The ECU constantly monitors the rotational speed of each wheel; if it detects a wheel rotating significantly slower than the others, a condition indicative of impending wheel lock, it actuates the valves to reduce hydraulic pressure to the brake at the affected wheel, thus reducing the braking force on that wheel; the wheel then turns faster. Conversely, if the ECU detects a wheel turning significantly faster than the others, brake hydraulic pressure to the wheel is increased so the braking force is reapplied, slowing down the wheel. This process is repeated continuously and can be detected by the driver via brake pedal pulsation. Some anti-lock systems can apply or release braking pressure 15 times per second.[23] Because of this, the wheels of cars equipped with ABS are practically impossible to lock even during panic braking in extreme conditions.
Maximum break Breaks greater than 147 are possible in a free ball situation. This has been achieved only once in professional competition, when Jamie Burnett made a 148 break in the qualifying stages of the 2004 UK Championship.