ADT Chassis, Suspension & Brake Systems

Question 1

What does the ABS system prevent during braking?

Accepted Answer

Wheel lock-up

Answer

The Anti-lock Braking System (ABS) is a crucial safety feature designed to prevent the wheels from locking up during hard braking. By rapidly modulating brake pressure to each wheel, ABS allows the driver to maintain steering control while braking. This significantly reduces stopping distances and improves vehicle stability, especially on slippery surfaces.

Question 2

What component connects the wheel hub to the suspension and allows for vertical movement?

Accepted Answer

Control arm

Answer

The control arm is a crucial component of a vehicle's suspension system, connecting the wheel hub or steering knuckle to the chassis. It acts as a pivot point, allowing the wheel to move up and down in response to road irregularities while maintaining proper wheel alignment. Control arms are typically equipped with bushings and ball joints to facilitate movement and absorb vibrations.

Question 3

What is the function of the Electronic Stability Control (ESC) system?

Accepted Answer

Helps maintain vehicle control

Answer

Electronic Stability Control (ESC), also known as Electronic Stability Program (ESP), is a computer-controlled system that enhances a vehicle's stability by detecting and reducing skidding. It works by monitoring steering angle, wheel speed, and yaw rate, and then selectively applying individual brakes or reducing engine power to help the driver maintain control during extreme steering maneuvers or slippery conditions.

Question 4

Why is brake fluid hygroscopic?

Accepted Answer

To absorb moisture

Answer

Brake fluid is hygroscopic, meaning it has a natural tendency to absorb and retain moisture from the air. This characteristic is problematic because water in the brake fluid can lower its boiling point, leading to vapor lock during heavy braking and reduced braking performance. Regular brake fluid flushes are necessary to remove accumulated moisture and maintain braking system integrity.

Question 5

Which suspension component helps absorb shocks from road irregularities?

Accepted Answer

Shock absorber

Answer

The shock absorber, often working in conjunction with a spring, is a key component of the suspension system designed to dampen oscillations and absorb kinetic energy from road irregularities. It controls the spring's movement, preventing excessive bouncing and ensuring the tires maintain consistent contact with the road. This provides a smoother ride and improved handling.

(ADT) Audi Diagnostic Technician Practice Test

(ADT) Audi Diagnostic Technician Practice Test

ADT Chassis, Suspension & Brake Systems