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Brake Servo (Duo)

The brake servo reduces the amount of pedal force the driver needs to apply when braking.
The two-stage system has a highly sensitive response. Up to a brake pressure of about 45 bar, known as the comfort braking range, the braking force is boosted five-fold. If the driver presses the brake pedal more forcefully, the braking force is boosted by up to a factor of ten. The driver notices this by the fast braking response combined with short pedal travel, good progressive brake modulation and reduced braking effort up to the point at which the ABS is activated.