The pistons squeeze out the brake fluid in there. The pressure thus generated in the brake system is transferred via pipelines to the wheel cylinders.
In them, the pistons press the brake pads against the brake discs.
On the rear wheels of front-wheel drive Audi-100s produced before December 1992 with a 4-cylinder engine, the brake pads are pressed against the brake drum. Other versions are equipped with disc mechanisms at the back. Disc brakes were also installed before 12/92 in cars with 4-cylinder engines, if the car was equipped with ABS brakes.
Fluid pressure flows into two independent piping systems (brake circuits), namely for one front wheel and the rear wheel located opposite it (diagonal separation of the brake system with dual-circuit drive). If one brake circuit fails, then one front wheel and the rear wheel on the other side of the vehicle can still be braked.
The parking brake acts on the rear wheels via a cable drive - it does not matter if drum or disc brakes are installed there.
In all-wheel drive models, as well as in front-wheel drive vehicles with 5- and 6-cylinder engines, ABS was also installed from the start of mass production (Anti Blocking System). In cars with a 4-cylinder engine, it was installed up to 12/92 only at will. You will learn more about ABS in the next chapter.
Note: If one brake circuit fails, you will need to apply much more pressure on the pedal (increasing pedal travel) for braking. The braking distance also becomes longer.
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