8 LS400 – NEW FEATURES System Diagram Brake Actuator Master Cylinder Pressure Sensor Pump Motor Relay Pump Motor ABS Solenoid Relay Control Solenoid Valves Speed Sensors Skid Control ECU Switching Solenoid Valves Stop Light Switch ABS Warning Light Function of Components 173LS03 The basic components of the Brake Assist system are the same as those of the VSC system. For details on the construction and operation of the components, see the 1998 Lexus New Car Features (Pub. No. NCF151U).
Components Function Brake Actuator Changes the fluid path based on the signals from the Skid Control ECU during the operation of the ABS & Brake Assist & TRAC & VSC system, in order to control the fluid pressure that is applied to the wheel cylinders. Master Cylinder Pressure Sensor Assembled in the brake actuator and detects the master cylinder pressure. ABS Warning Light Lights up to alert the driver when the Skid Control ECU detects the malfunction in the ABS or brake assist system. Multi-Information Display (CHECK VSC) Alerts the driver when the Skid Control ECU detects a malfunction in the VSC system.
Skid Control ECU Judges the vehicle driving condition based on signals from each sensor, and sends brake control signal to the brake actuator. Speed Sensors Detect the wheel speed of each of four wheels. Stop Light Switch Detects the brake signal.