The composition of the working brake system includes:
- master brake cylinder (further - GTZ) with a vacuum brake booster and with an expansion tank of the hydraulic system; four wheel brake cylinders;
- rigid hydraulic pipelines to the wheels;
- flexible hoses supplying pressure to the wheel cylinders.
The brake master cylinder is designed for use in diagonal split systems. One front and one diagonally opposed rear brake is served by the primary piston. The opposite front and rear brakes are serviced by a secondary piston. The brake master cylinder performs the functions of a standard dual brake master cylinder and also includes a low fluid level indicator and restrictor valves for non-ABS brakes. Restriction valves limit the pressure on the rear brakes when the master brake cylinder reaches a predetermined pressure,
The master brake cylinder is equipped with a fluid level sensor. This sensor activates the BRAKE warning light circuit when the brake fluid level in the reservoir is dangerously low.
The amplifier is a single diaphragm vacuum type amplifier. In the normal state, when the brake pedal is released, there is a vacuum on both sides of the diaphragm of the vacuum booster.
When the brake pedal is depressed, atmospheric air pressure is applied to one side of the diaphragm, providing boost. When the brake pedal is released, the air supply to that side of the diaphragm stops. The air is then removed from the booster through a vacuum valve.