How can one tell that the brake pads are worn and need to be replaced?

1. ABy the rate at which the brakes cool down during hard braking.
2. BOnly after an inspection at a licensing institute can the degree of wear of the pads be known.
3. CIt cannot be known, only when the pads are completely worn - then they must be replaced.
4. DThere is a mark on the brake pads, noticeable as they wear, by which it can be detected.

Pick an answer to test yourself