Suspension - Audi A8 2019 Service Training

Suspension

Brake system
Front axle
17 – 18" 6-piston brake calipers are used on the front axle.
10-piston brake calipers are available as an option in com-
bination with the 20" ceramic disc brakes.
Rear axle
The rear axle brake calipers (17" and 18", 19" for ceramic
brakes) come equipped with the electromechanical parking
brake (EPB).
As in the current Q7, Q5 and A4 models, the front and rear
wheel brakes in the Audi A8 have separate brake circuits.
Brake booster
9/9" tandem brake boosters are used.
ESC unit
ESP 9 is used in the Audi A8. Depending on trim level, brake
pressure is built up by hydraulic pumps with two or six
pistons. In the basic trim of the vehicle, pumps with two
pistons are used in combination with a pressure sensor for
measuring the driver's input brake pressure. Vehicles with
ACC are equipped with the six-piston version. Here, two
additional pressure sensors measure the pressures in both
brake circuits.
A new function is the loose wheel detection. Loose wheels
are detected by evaluating the wheel vibrations. If a loose
wheel is detected, the driver receives a warning.
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Front wheel brake
Rear wheel brake with EPB
Brake booster
ESC unit
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