Skip to main content

Anti-lock Brake System


Anti-lock Braking System (ABS) is a program designed in your vehicle's braking system that prevents your car's wheels from locking up during a hard braking application. This, in turn, helps the driver have more control in braking in hard conditions and prevents your car from skidding.

  • Upon depressing the brake pedal, the brake pads will engage in between the rotor disc, causing the wheels to stop rotating. As the wheels stop, frictional force will occur by the slippage of the wheels against the road causing the vehicle to stop moving.
  • A vehicle with an ABS system comprises of sensors on each wheel modulated by an electronic control unit/ or modular unit, wherein its purpose is to process information or signals from the sensors to maintain, increase or decrease the pressure that prevents wheels from locking. 
  • The antilock brake system allows the brakes to apply until the tires are almost starting to skid. The antilock braking system can vary or modulate the hydraulic pressure to the brake at each wheel and keeps the rate of the wheel deceleration below the speed at which the wheels can lock

ABS Hydraulic Unit

 The control module continuously compares the rotary speeds of the four wheels, As long as all are turning at the same speed, the control module will not operate. When a wheel begins to decelerate faster than the other wheels, the control module signals the ABS relay to activate the hydraulic unit. One or more solenoids in the hydraulic unit open and closes the flow control valves in the brake lines. The actions of the solenoid valves hold or release the hydraulic pressure to each brake.