Conventional hydraulic brakes rely on pressure generated in the system when the driver pushes the brake pedal. A further development on this was to incorporate electricals in the hydraulic circuit. On depressing the brake pedal a valve opens and releases pressure to the cylinders at the wheel. Also known as power brakes, these electrohydraulic brakes are a vast improvement on traditional mechanical-hydraulic version of brakes.
The purely electrohydraulic braking system works this way:
Apart from the electrohydraulic circuit, the unit also has manual backup in case of any electrical failure of the component or the circuit.
As always hydraulic and electrical systems have room for improvement. Better hydraulic fluids can be developed that are capable of resisting moisture and heat.