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 (sensor) constantly sends an AC signal to Anti-lock Brake Control Module (ABCM). This information is translated to wheel rotation speed. When ABCM determines that wheel lock-up is about to occur, it activates electromagnetic Isolation (ISO) Solenoid Valve (dump valve), located inside Hydraulic Control Unit (HCU), to increase or decrease hydraulic pressure to each wheel. HCU is not serviceable, and must be replaced as an assembly.