The primary components of the antilock braking system are: The electronic control unit, hydraulic control unit or modulator, power booster & master cylinder assembly and wheel sensor unit.
The antilock braking system prevents wheels locking or skidding, no matter how hard brakes are applied, or how slippery the road surface. Steering stays under control and stopping distances are generally reduced.
The antilock braking system controls braking force by controlling the hydraulic pressure of the braking system, so that the wheels do not lock during braking.
The tandem master cylinder transforms applied brake force into hydraulic pressure which is transferred to the wheel units through two separate circuits. This provides residual braking in the event of fluid loss.
The hydraulic control unit, or modulator, executes commands in the form of electrical signals from the ABS Control Module. It uses solenoid valves to change the hydraulic pressure in the brake circuit.
Wheel speed sensors consist of a toothed rotor and a pickup. Wheel rotation sends input signals to the ECU, which processes them and controls the hydraulic control unit.
The ECU receives signals from various sources. The brake pedal, the ignition system, and wheel speed sensors control the hydraulic control unit and anticipate wheel lock.
