Red Seal Automotive Service Technician Practice Exam

Using a tread depth gauge or the penny test is a reliable method to check the tread depth of a tire. A tread depth gauge is a specialized tool designed to provide a precise measurement of the remaining tread depth, which is critical for ensuring adequate traction and safety on the road. The penny test, on the other hand, is a simple and effective technique that involves inserting a penny into the tread grooves with Lincoln's head facing down. If the top of Lincoln's head is visible, the tread is considered too shallow and indicates that the tire may need to be replaced. Both these methods are widely recognized and used because they offer direct insights into the tire's condition, helping to maintain vehicle safety and performance.