Red Seal Truck and Transport Mechanic Practice Exam

Which of the following components can cause erratic steering in trucks?

1. Worn brake pads

2. Defective fuel injectors

3. Worn ball joints or tie rod ends

4. Leaking oil pan

The correct answer is: Worn ball joints or tie rod ends

Erratic steering in trucks is commonly caused by worn ball joints or tie rod ends. These components are part of the steering and suspension systems, which are crucial for maintaining proper vehicle handling and control. When ball joints or tie rod ends wear out, they can lead to play or looseness in the steering system. This excess play results in a lack of responsiveness when turning the steering wheel, causing the truck to maneuver unpredictably. The driver may feel that the steering is vague or unresponsive, which can make it challenging to keep the vehicle on course, especially at higher speeds or during turns. In contrast, worn brake pads, defective fuel injectors, and a leaking oil pan primarily affect other vehicle functions. Worn brake pads are more associated with braking performance and not directly linked to steering responsiveness. Defective fuel injectors impact the engine's performance and efficiency rather than the steering system. A leaking oil pan could lead to engine oil loss, which might affect engine operation but would not influence steering dynamics. Therefore, recognizing the specific roles of these components emphasizes why worn ball joints or tie rod ends are the main culprits behind erratic steering.