With overheating of the brakes the braking performance:
Show the correct answer
Correct answer
B. may decrease.
Explanation
The question is about the effect of overheated brakes on the braking performance of a lorry. Overheated brakes brake less effectively - the answer is B.
The Road Traffic Act requires a vehicle to be maintained in such a way that using it does not endanger safety, and that the driver can use the brake reliably. Overheating is dangerous for brakes: hot brake linings and discs or drums lose friction, and with drums the drum also expands, so the shoes press against it less strongly. The driver feels that they are pressing the pedal harder and harder, but the vehicle hardly slows down. So it is not true that braking performance increases (answer A) or that it does not change (answer C). Brakes most often overheat on long downhill stretches, so there you use engine braking, the retarder and a suitably low gear.
Legal basis: Art. 66 para. 1 point 1 and 5 of the Road Traffic Act (Prawo o ruchu drogowym)