What is the purpose of the yellow trims on the front wheel nuts of the lorry?

Explanation: • They are purely decorative: No, they do serve a practical purpose.
• They help keep the wheel nuts clean and free from rust: No, although they may, in practice do this, but this is not their real purpose.
• They cover any noise coming from squeaking wheel nuts: No, they would not cover any noises and. should such a noise be coming from the wheel nut area, it may suggest a defect.
• They indicate any movement of the wheel nuts: Correct - they are fitted in pairs with the arrow pointing toward each other, if the nut comes loose, it immediately becomes more noticeable to the driver.

Category: CPC Case Studies: Technical Matters