Final answer:
The most commonly used type of king pin bushings by axle manufacturers is Composite (B), due to its durability and resistance to wear under heavy loads, making it the industry standard. Option B is correct.
Step-by-step explanation:
The type of king pin bushings most commonly used by axle manufacturers is Composite (B). Composite bushings are popular due to their durability and resistance to wear and deformation under high loads. They provide an excellent compromise between affordability and performance, which is why they've become the industry standard for heavy-duty trucks and trailers.
Unlike nylon, bronze, or brass bushings, composites can handle both the heavy loads and the high-frequency movement found in commercial vehicle applications. Composites are made of a mixture of different materials, often including resins and strengthening fibers, which together offer improved performance characteristics over single-material bushings.
The most commonly used type of king pin bushings by axle manufacturers currently are Composite bushings.
Composite bushings are made from a combination of materials such as fiberglass, Teflon, or carbon fiber, which provide excellent strength, durability, and low friction. They are often preferred over other types of bushings because of their superior performance.
Nylon bushings (option A) are not commonly used anymore due to their limited lifespan and susceptibility to wear. Bronze (option C) and brass (option D) bushings are still used in some applications, but composite bushings have become the go-to choice for axle manufacturers.