Audi Q7 e-tron quattro 4M - Electro-Mechanical Brake Servo

69
Even in electric-only mode, it is necessary to boost brake pressure
when braking is applied by the driver. The intake manifold vacuum
of the internal combustion engine cannot be utilised, because it is
only available during conventional vehicle operation. The use of the
electro-mechanical brake servo makes it possible to dispense with
an additional vacuum pump in combination with a pneumatic
brake servo.
Electro-mechanical brake servo
The electro-mechanical brake servo oers the following key advan-
tages over a conventional pneumatic brake servo:
• Vacuum-independent brake servo
• High pressure generation dynamics
• High pressure regulation accuracy
• Constant brake pedal characteristic/pedal force
649_142
649_143
Overview
Brake fluid reservoir
Tandem master brake cylinder
Brake servo control unit
J539
Push rod (brake pedal connection)
Engine-gearbox unit
Brake pedal position sender
G100
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