ADT Chassis, Suspension & Brake Systems 2

Question 1

An Audi with adaptive air suspension (CDC) shows a fault code for the front right shock absorber control. What is the most likely cause?

Accepted Answer

Failed CDC valve inside the damper unit

Answer

CDC faults specific to one damper typically point to the continuously variable damping valve integrated inside that shock absorber unit.

Question 2

When bleeding Audi electro-hydraulic brakes (e.g., SQ7 integrated braking system), which special procedure is required compared to conventional systems?

Accepted Answer

The brake actuator must be cycled via VCDS to move fluid through internal solenoid circuits

Answer

Integrated brake systems contain solenoid-controlled internal circuits that trap air unless cycled through dealer-level software such as VCDS or ODIS.

Question 3

A technician measures lateral runout on an Audi front rotor and finds 0.12 mm. The factory spec is 0.07 mm max. What is the BEST first corrective action?

Accepted Answer

Index the rotor to a different stud position and re-measure

Answer

Re-indexing the rotor 1–2 stud positions often reduces runout caused by hub face irregularities before more invasive repairs are needed.

Question 4

On Audi vehicles with torque vectoring (sport differential), what braking-related interaction must a technician consider during brake service?

Accepted Answer

The sport differential can apply individual rear brake pressure for yaw control, affecting pedal feel testing

Answer

The sport differential uses hydraulic clutch packs and can interact with ESP torque vectoring braking, so road-test pedal feel should be verified after service.

Question 5

During a four-wheel alignment on an Audi B9 A4, the rear camber is within spec but rear toe is excessively toed-out on one side. Which component is MOST likely bent or worn?

Accepted Answer

Rear toe link (inner or outer eccentric)

Answer

On B9 Audi platforms, rear toe is set by the toe link with eccentric adjusters; damage or worn bushings at that link cause toe deviation.

(ADT) Audi Diagnostic Technician Practice Test

(ADT) Audi Diagnostic Technician Practice Test

ADT Chassis, Suspension & Brake Systems 2