Principle of Operation

For normal brake operation, the brake booster assembly assists brake pedal pressure and the force is transmitted to the master cylinder assembly. The master cylinder assembly converts brake pedal movement to hydraulic pressure. Primary and secondary brake pipe circuits supply the hydraulic pressure via the ABS hydraulic unit to the brake calipers.

The primary circuit supplies the front right and rear left brakes while the secondary circuit supplies the front left and rear right brakes. The engine intake manifold provides the brake booster assembly with vacuum through a pipe and non-return valve.