Increased friction during braking leads to the generation of heat as a result of the energy being transformed during the braking process. When brake components, such as pads and rotors, come into contact, the friction between these surfaces creates heat as kinetic energy is converted to thermal energy. This heat is a crucial aspect of the braking system's operation, as it can impact performance if it becomes excessive, potentially leading to brake fade or reduced effectiveness.
The other options do not accurately reflect the consequences of increased friction during braking. For instance, while some might think that increased friction could lead to better stopping power and thus a decreased stopping distance, this is not a direct result of increased friction itself without considering other factors like braking system design and conditions. Similarly, increased friction does not relate to fuel efficiency or reduced tire wear in a straightforward manner, as both fuel consumption and tire health are influenced by various factors beyond just friction during braking.