TRAC Brake actuator The trac brake actuator consists of two cut solenoid valves and three spring loaded valves which regulate the brake fluid pressure n the right and left rear wheels the rear wheels are controlled independently through the abs actuator based on signals from the ABS ECU The master cylinder cut solenoid valve opens and closes the hydraulic circuit from the master cylinder or trac pump to the abs actuator. When the trac system is operating it supplies the brake fluid pressure from the trac pump to the disc brake cylinders via the abs actuator it also prevents the fluid from flowing out of the ABS actuator pump to the master cylinder. The reservoir cut solenoid valve is located between the return side of the abs 3-position solenoid and the master cylinder. It returns the fluid from the disc brake cylinders back to the master cylinder reservoir. The pressure regulator valve controls the brake fluid pressure generated by the trac pumpTRAC Brake Actuator The TRAC brake actuator consists of two cut solenoid valves and three spring loaded valves which regulate the brake fluid pressure in the right and left rear wheels. The rear wheels are controlled independently through the ABS actuator based on signals from the ABS ECU. The master cylinder cut solenoid valve opens and closes the hydraulic circuit from the master cylinder or TRAC pump to the ABS actuator. When the TRAC system is operating, it supplies the brake fluid pressure from the TRAC pump to the disc brake cylinders via the ABS actuator. It also prevents the fluid from flowing out of the ABS actuator pump to the master cylinder. The reservoir cut solenoid valve is located between the return side of the ABS 3-position solenoid and the master cylinder. It returns the fluid from the disc brake cylinders back to the master cylinder reservoir. The pressure regulator valve controls the brake fluid pressure generated by the TRAC pump