Anti-Lock Brake System (Abs)

During normal driving and braking operation, ABS performs by automatically modulating braking pressure during an emergency stop to prevent wheel lock-up. Each wheel speed sensor constantly sends a digital signal to the Electronic Control Unit (ECU). This information is translated to wheel rotation speed. When the ECU determines that wheel lock-up is about to occur, ECU activates electromagnetic solenoid valve (dump valve), located inside Hydraulic Control Unit (HCU), to increase or decrease hydraulic pressure to each wheel. The HECU is an integrated unit consisting of the ECU and HCU. Both the HCU and ECU are serviceable parts, but neither is repairable.

NOTE: A slight pulsation is usually felt through brake pedal during ABS operation.

Electronic Brake Force Distribution (EBD) function is an additional program to the conventional ABS program that allows greater utilization of rear brakes up to the point of ABS intervention. EBD replaces Pressure Conscious Regulator Valves (PCRV) used in conventional braking systems. EBD can come into operation during regular braking, depending on the load of the vehicle and surface friction. In contrast to the PCRV, during EBD control, the brake force is determined not by brake pressure or vehicle speed but by wheel slip.