NOCTI Automotive Technology 2 — Questions and Answers
Question 1: What type of system uses hydraulic pressure transmitted through brake fluid to actuate wheel brakes?
- Pneumatic brake system
- Mechanical linkage system
- Hydraulic brake system (Correct answer)
- Electronic brake system
Correct answer: Hydraulic brake system
Automotive hydraulic brake systems use incompressible brake fluid to transmit force from the master cylinder to the wheel cylinders or calipers.
Question 2: What is the purpose of the ABS (Anti-lock Braking System) in a vehicle?
- Increase brake pad life by reducing friction
- Prevent wheel lockup during hard braking to maintain steering control (Correct answer)
- Automatically apply brakes when the vehicle exceeds the speed limit
- Balance brake force equally between all four wheels at all times
Correct answer: Prevent wheel lockup during hard braking to maintain steering control
ABS rapidly modulates brake pressure to prevent the wheels from locking, allowing the driver to maintain steering control during emergency stops.
Question 3: A vehicle pulls consistently to one side during normal braking. Which component is the MOST likely cause?
- Worn tie rod end
- Seized or sticking brake caliper on the pulling side (Correct answer)
- Faulty wheel speed sensor
- Worn control arm bushing
Correct answer: Seized or sticking brake caliper on the pulling side
A seized or dragging caliper applies uneven braking force, causing the vehicle to pull toward the side with more brake clamping force.
Question 4: Which suspension component directly connects the wheel hub/steering knuckle to the vehicle frame and controls wheel travel?
- Tie rod
- Sway bar link
- Control arm (Correct answer)
- Shock absorber
Correct answer: Control arm
The control arm links the steering knuckle to the vehicle frame, allowing controlled up-and-down wheel movement while maintaining proper alignment geometry.
Question 5: What causes brake fade in a heavily used drum brake system?
- Excessive brake fluid pressure
- Heat buildup reducing friction between shoes and drum (Correct answer)
- Air entering the brake lines
- Worn wheel bearings causing drum wobble
Correct answer: Heat buildup reducing friction between shoes and drum
Brake fade occurs when excessive heat from repeated braking reduces the coefficient of friction between the brake shoes and drum, decreasing stopping power.
Question 6: What is the recommended action when a disc brake rotor measures below the manufacturer's minimum thickness specification?
- Resurface the rotor on a brake lathe
- Replace the rotor (Correct answer)
- Apply a friction coating to restore thickness
- Use thicker brake pads to compensate
Correct answer: Replace the rotor
A rotor below minimum thickness specification must be replaced because it cannot safely absorb and dissipate heat, risking brake failure.
Question 7: Which type of wheel bearing is most commonly found on the front non-drive axle of modern front-wheel-drive vehicles?
- Tapered roller bearing
- Ball bearing hub assembly (Correct answer)
- Needle roller bearing
- Sleeve bushing bearing
Correct answer: Ball bearing hub assembly
Modern front-wheel-drive vehicles commonly use sealed ball bearing hub assemblies that require no adjustment or periodic greasing.
NOCTI Automotive Technology 2
What type of system uses hydraulic pressure transmitted through brake fluid to actuate wheel brakes?