Which of the mentioned factors induces the operation of the parking brake?
Show the correct answer
Correct answer
B. Pressure on the springs.
Explanation
This question is about what makes the parking brake work. The parking brake works thanks to spring pressure - the answer is B.
The parking brake in a tram is a passive brake: a strong spring presses the linings against the disc or drum, and energy is needed to release the brake, for example from an electromagnet or a hydraulic system. Thanks to this, the brake also works when there is no power supply - the tram stays braked. In this system, the electromagnetic coil (answer A) is used for releasing the brake, not for braking, and the lever system (answer C) only transmits the force. This design increases safety while the tram is parked.
Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym)