ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairHard
A customer reports a slow leak from one of their tires. Upon inspection, the technician finds a nail embedded in the tread area, approximately 1 inch from the sidewall. The nail has pierced through the tire. What is the MOST appropriate repair action?
- APerform a patch-plug combination repair from the inside.
- BPerform an external plug repair.
- CApply a liquid tire sealant.
- DReplace the tire.
Show answer & explanationAnswer & explanation
Correct answer: D. Replace the tire.
Industry standards (e.g., RMA guidelines) specify that tire repairs are only permissible in the tread area within certain limits, typically excluding punctures too close to the sidewall. A puncture 1 inch from the sidewall is usually considered too close, making replacement the safest option.
Why the other options are wrong
- A. A patch-plug combination is the correct method for a permanent repair, but only if the puncture is within the repairable area of the tread. A puncture 1 inch from the sidewall is outside this area.
- B. External plugs are generally considered temporary repairs and are not recommended as a permanent solution, especially for punctures near the sidewall.
- C. Liquid tire sealants are temporary fixes and not a permanent, safe repair method for any puncture, especially not one in a critical, non-repairable area.
Tire Repairable Area
The specific central section of a tire's tread where punctures can be safely and permanently repaired according to industry guidelines.
- Excludes sidewall and shoulder areas due to high flex.
- Typically defined as the center ~2/3 to 3/4 of the tread width.
- Puncture size limits also apply (e.g., 1/4 inch diameter).
Memory trick: Sidewall leak? No fix, just replace for safety's sake!