The pistons displace the brake fluid in the cylinder. The resulting hydraulic pressure is distributed in the brake system via pipes and hoses to the wheel cylinders.
In cylinders, pistons press the brake pads against the brake disc or, on the rear wheels of models with less powerful engines, the brake pads.
Fluid pressure is transmitted to the brake cylinders through two independent pipelines (brake circuits), namely to the front wheel and the opposite rear wheel (diagonally distributed dual circuit brakes).
If one circuit fails, then the front wheel and the rear wheel on the other sides remain operational. With the front wheel unbraked, it is possible to turn and the rear wheel unbraked keeps the rear of the car in the wheel
Manual (parking) the brake acts through the cables on the rear wheels, regardless of whether the brakes are installed - drum or disc.
Some Audi models are equipped with anti-lock brakes (ABS) Bosch company.
Attention: If one of the brake circuits fails, it is necessary to press the brake pedal with more force (with longer pedal travel), to get the same brake performance.
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