What does a rise in brake pedal effectiveness indicate after starting the engine?

A rise in brake pedal effectiveness after starting the engine signifies that the brake booster is functioning properly. The brake booster is designed to enhance the force applied to the brake pedal, enabling the driver to exert less effort while achieving the desired braking force. When the engine starts, the vacuum generated by the engine assists in amplifying the pressure applied to the brake pedal, leading to improved responsiveness and effectiveness.

If there were any issues with the brake system, such as faults in other components, the brake pedal effectiveness would not typically increase. Similarly, excessive wear on brake pads would likely result in diminished braking capability rather than an increase. An imbalance in brake fluid could lead to other braking issues but wouldn’t directly cause an increase in pedal effectiveness after the engine starts. Therefore, the observation of increased effectiveness directly correlates with the proper operation of the brake booster.