Michigan CDL - Air Brakes Practice Exam

Where are foundation brakes used in a vehicle?

1. Only at the rear axle

2. At each wheel

3. Only at the front axle

4. In the engine compartment

The correct answer is: At each wheel

Foundation brakes are typically located at each wheel of a vehicle. This setup allows for effective and balanced braking, as each wheel can apply force independently, enhancing the vehicle's overall stopping power and control. By having foundation brakes at each wheel, the system can respond more effectively to various driving conditions, providing better stability and safety. The design of having brakes at each wheel also ensures that the wear and heat generated from braking are distributed across multiple components, which helps in maintaining the efficacy of the braking system over time. This is particularly important for larger vehicles or those that carry heavy loads, where consistent and reliable braking performance is crucial. In contrast, having foundation brakes only at specific points, such as at the rear or front axle, would not provide the same level of control or safety. Placing them in the engine compartment is not feasible, as that area is not designed for braking components and would not allow for effective braking performance.