General information (Opel Insignia A)

The car is equipped with a TRW EBC450 braking system.

The Electronic Brake Control Unit (EBCM) and the brake pressure modulator valve are serviced separately.

The brake pressure modulator valve uses 4 circuit configurations to regulate hydraulic pressure independently for each wheel.

The car can also be equipped with the following systems:

• Anti-lock braking system (ABS).
• Anti-skid system (traction control).
• Stability control system.
• Automatic regulation of pressure in the brake circuits.
• Hill Start Assist.
• Brake assist system for emergency braking.
• Braking system when cornering.
• Trailer stabilization system.

To ensure the operability of these systems, the following components are used:

• Electronic Brake Control Unit (EBCM) - controls the brake systems and detects faults. It supplies voltage to the electromagnetic valves and the pump motor.
• A brake circuit pressure modulator valve consisting of: a hydraulic pump with a motor, four isolation valves, four pressure relief valves, two supply and two isolation valves for controlling the traction control system and the electronic stability control system, a pressure sensor, a high-pressure damper and a low-pressure accumulator.
• Hydraulic pump with electric motor.
• Four isolated circuits.
• Four damping valves.
• Two check valves for supplying the anti-skid and stability control systems.
• Two isolation valves for supplying the anti-skid and stability control systems.
• Pressure sensor.
• High pressure suppressor.
• Low pressure accumulator.
• Multi-axis acceleration sensor - the yaw, longitudinal and lateral acceleration sensors are combined into one multi-axis acceleration sensor, connected to the electronic unit. The electronic brake control unit, based on the signals received, activates the stability control system or hill start assist.
• Steering wheel angle sensor - the electronic brake control unit, based on signals received from the steering wheel angle sensor, calculates the required value of angular acceleration.
• Traction control switch - The traction control system and stability control system can be manually switched off or on by pressing this switch.
• Wheel speed sensors - The electronic brake control unit sends 12 volts to each wheel speed sensor. As the wheels rotate, the speed sensors generate square wave signals, which the electronic control unit uses to calculate the wheel speed.