What does the term "pedal reserve" refer to in brake systems?

The term "pedal reserve" is primarily associated with the brake system's safety and effectiveness during operation. Specifically, it refers to the amount of total pedal travel left in reserve when the brake pedal is depressed, which is crucial for ensuring that the brakes are functioning properly and can engage fully without reaching the limit of their travel.

A well-functioning brake system should maintain a certain amount of pedal reserve to guarantee responsiveness and control when the brakes are applied. If the pedal travels a too great distance before making contact with the braking mechanism, it may indicate potential issues, such as air in the brake lines or worn brake components. Therefore, having sufficient pedal reserve is critical not only for performance but also for the safety of the vehicle's braking system.

The other statements focus on different attributes of brake performance, such as force application or travel before engagement, but they do not capture the specific meaning of the term "pedal reserve" in the context of brake systems.