During the 90s, Anti-lock Brake System or ABS may be a premium, and only matched in luxury cars only. But now, the ABS is standard system should have in the European market cars. These systems prevent the tire locked during sudden braking or on slippery surfaces. Actually when tires locked during braking, distance to stop the car will be much more because the tires lost traction at the time.
Drivers will also lose steering control because when the tires locked, car will continue recklessly forward despite steering is turned to the left or to the right, and will cause the driver can not avoid obstacles in front. Brakes with ABS systems are still using conventional brake hydraulic system as usual. But it has a modulator that works when the tires start to lock. This modulator will release brake pressure to prevent it locks and then give back pressure to the brake calliper. The process takes place very quickly, less than a second for each session to ensure the shortest stopping distances can be achieved.
How modulator controls the brake hydraulic system?
Modulator ABS system is not working alone. It was also aided by the speed sensors (wheel speed sensors) are placed on each tire and also a computer box to process data received from the speed sensor. Computer box will detect if there is a tire that will be locked when the driver brakes through the readings taken from the speed sensor. Then it will direct modulator to release the pressure on the brake system and put pressure back after several milliseconds. If the tires can still locked, the computer box will direct modulator to do that again until the driver's foot from the brake pedal release. And the whole process can occur in less than one second.
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