Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Brake master cylinder ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist switching valve OFF OFF Holding valve Skid Control ECU Check valve Port a OFF Holding valve Check valve OFF Reduction valve Pump Port b OFF (OFF) Check valve Reduction valve Reservoir Front Rear Speed sensor Speed sensor (2/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Brake master cylinder ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist switching valve OFF ON Holding valve Skid Control ECU Check valve Port a ON Holding valve Check valve ON Reduction valve Pump Port b OFF (ON) Check valve Reduction valve Port e Reservoir Front Rear Speed sensor Speed sensor (2/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Brake master cylinder ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist switching valve OFF ON Holding valve Skid Control ECU Check valve Port a ON Holding valve Check valve OFF Reduction valve Pump Port b OFF (ON) Check valve Reduction valve Port e Reservoir Front Rear Speed sensor Speed sensor (2/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Brake master cylinder ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist switching valve OFF OFF Holding valve Skid Control ECU Check valve Port a OFF Holding valve Check valve OFF Reduction valve Pump Port b OFF (ON) Check valve Reduction valve Reservoir Front Rear Speed sensor Speed sensor (2/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Inspection method SST Hand-held tester SST Battery Harness on the SST side Harness on the vehicle side Hand-held tester (3/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator Hydraulic Circuit Master cylinder Flow control valve ABS actuator Check valve Pump Check valve Speed sensors Reservoir ABS ECU 2-position solenoid valve Front left Rear right Rear left Front right (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator 2-position solenoid valve (4) with flow control valve (4) Hydraulic Circuit Master cylinder Flow control valve ABS actuator Check valve Pump Check valve Speed sensors Reservoir ABS ECU 2-position solenoid valve Front left Rear right Rear left Front right (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator Hydraulic Circuit 2-position solenoid valve (6) with pressure increase valve (2) Master cylinder ABS actuator Pressure increase valve Front main solenoid valve Check valve Pump Rear solenoid valve Check valve Speed sensors Reservoir Front subsolenoid valve ABS ECU Front left Rear right Rear left Front right (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator Hydraulic Circuit 3-position solenoid valve (3) with mechanical valve (1) Master cylinder 3-position solenoid valve ABS actuator Check valve Pump Check valve Reservoir Speed sensors ABS ECU Mechanical valve Front left Rear right Rear left Front right (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator Hydraulic Circuit 3-position solenoid valve (4) Master cylinder ABS actuator 3-position solenoid valve Check valve Pump Speed sensors Check valve Reservoir ABS ECU Deceleration sensors Front left Rear right Rear left Front right *Some models only (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Control ABS with EBD General/ Operation Front / Rear wheels brake force distribution Braking force distribution at the distribution control of front-rear braking force Rear braking force Ideal distribution under heavy load Ideal distribution under light load Amount of the Under heavy load braking fore improvement under heavy load Under light load When the braking force distribution of front-rear is fixed Front braking force Right / Left wheels brake force distribution (During cornering braking) During cornering braking (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA BA (Brake Assist) Control General System Diagram Speed sensor Master cylinder pressure sensor Brake actuator Skid Control ECU ABS warning light Stop light switch Braking force with BA without BA Time (1/2) Diagnosis Technician >> Brake >> ABS, EBD and BA BA (Brake Assist) Control Operation Brake master cylinder ABS & VSC & TRC & BA brake actuator Emergency brake Pressure sensor relief Valve Brake assist switching valve ON Skid Control ECU Check Valve OFF Holding valve OFF Holding valve Check Valve Pump OFF (ON) Check Valve OFF Reduction valve Reduction valve Check Valve Reservoir Front Speed sensor Rear Speed sensor (2/2) Diagnosis Technician >> Brake >> ABS, EBD and BA Diagnosis Technician >> Brake >> ABS, EBD and BA Construction When the Skid Control ECU has Failed from Power source system Combination meter ECU ABS WA Brake BRL ABS warning light Service connector WA ABS control relay ABS actuator Motor relay Pump motor Solenoid relay RF SOL LF SOL RR SOL LR SOL ECU (1/1) ... Brake >> ABS, EBD and BA Diagnosis Technician >> Brake >> ABS, EBD and BA Construction When the Skid Control ECU has Failed from Power source system Combination meter ECU ABS WA Brake BRL ABS warning... Technician >> Brake >> ABS, EBD and BA Types of Brake Actuator Hydraulic Circuit Master cylinder Flow control valve ABS actuator Check valve Pump Check valve Speed sensors Reservoir ABS ECU 2-position... Speed sensor Speed sensor (2/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Brake master cylinder ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist