MTO Vehicle Maintenance & Inspection 3 — Questions and Answers
Question 1: What does it mean when your vehicle's brake pedal feels spongy or goes to the floor?
- Brake pads are worn thin
- Air is in the brake lines or brake fluid is low (Correct answer)
- The parking brake is partially engaged
- Rotors are warped
Correct answer: Air is in the brake lines or brake fluid is low
Air in the hydraulic brake lines compresses unlike fluid, causing a spongy pedal that reduces braking effectiveness.
Question 2: What minimum tire tread depth is generally required in most U.S. states before a tire is considered unsafe?
- 4/32 inch
- 2/32 inch (Correct answer)
- 6/32 inch
- 1/16 inch
Correct answer: 2/32 inch
Most states legally require at least 2/32 inch of tread depth, which is the wear indicator bar level.
Question 3: What does white smoke from the exhaust typically indicate?
- Rich fuel mixture
- Coolant burning in the combustion chamber (Correct answer)
- Worn piston rings
- Clogged catalytic converter
Correct answer: Coolant burning in the combustion chamber
White smoke often signals a blown head gasket allowing coolant to enter and burn in the cylinders.
Question 4: How often should a vehicle's serpentine belt typically be inspected?
- Every 3,000 miles
- Every oil change or at least annually (Correct answer)
- Only when it snaps
- Every 100,000 miles
Correct answer: Every oil change or at least annually
The serpentine belt drives critical components like the alternator and water pump, so regular inspection prevents sudden failure.
Question 5: What could cause a grinding noise when turning the steering wheel?
- Low windshield washer fluid
- Worn CV joint or low power steering fluid (Correct answer)
- Faulty oxygen sensor
- Clogged fuel filter
Correct answer: Worn CV joint or low power steering fluid
A worn CV joint or low power steering fluid can cause grinding or clicking sounds during turns.
Question 6: What is the role of the alternator in a vehicle?
- Stores electrical energy to start the engine
- Generates electricity to charge the battery while driving (Correct answer)
- Controls the fuel injection system
- Regulates engine temperature
Correct answer: Generates electricity to charge the battery while driving
The alternator converts mechanical energy from the engine into electricity to power the vehicle's systems and recharge the battery.
Question 7: A vibration felt in the steering wheel at highway speeds most commonly indicates:
- Low engine oil
- Unbalanced or improperly inflated tires (Correct answer)
- Failing water pump
- Dirty fuel injectors
Correct answer: Unbalanced or improperly inflated tires
Unbalanced tires create a rhythmic vibration that is most noticeable at higher speeds through the steering wheel.
MTO Vehicle Maintenance & Inspection 3
What does it mean when your vehicle's brake pedal feels spongy or goes to the floor?