A.B.S. (Anti-Lock Braking System ABS)
Hydraulic A.B.S. - How it works
Hydraulic Anti-lock braking systems as fitted to cars and light commercial vehicles.
The ABS controls braking forces by controlling the vehicle's brake system hydraulic pressure to prevent the road wheels from locking up during heavy braking forces. The braking force is controlled by a combination of factors.
Wabco Air Brakes A.B.S.
An overview of HGV air braking A.B.S. systems. Heavy vehicles use compressed air to operate their braking system due to the size and weight of the vehicle requiring larger braking forces.
The ABS system, monitors individual wheel speeds many times per second. When braking, if the ABS control unit detects the wheel is slowing down too much (about to skid), it momentarily release the brakes to regain traction. This is also done many times per second. This momentary release in small pulses is called modulation.
The ABS is there to provide directional stability under heavy braking, allowing some degree of steering and reducing the stopping distance that would otherwise be very long if the vehicle was in a skid.