What component is energized by the adjusting screw during forward braking?

The component that is energized by the adjusting screw during forward braking is the secondary shoe. In drum brake systems, the primary and secondary shoes work together to create friction against the drum and facilitate vehicle stopping. The secondary shoe is usually positioned to receive the force generated when the brakes are applied, and during the adjustment process, the adjusting screw applies tension, allowing the shoe to engage more fully against the drum.

The adjusting screw plays a crucial role in ensuring that the secondary shoe is properly positioned for effective braking. As the screw is turned, it pushes against the secondary shoe, causing it to move outwards and increase contact with the brake drum. This action enhances braking performance by providing a more significant surface area for friction, thereby allowing the vehicle to slow down effectively.

Other components such as the primary shoe, return spring, and wheel cylinder have their specific functions, but in the context of being energized by the adjusting screw during braking, the secondary shoe is the primary component involved. Proper adjustment of the secondary shoe is vital for optimal braking efficiency and safety.