Question

Technician a says drum brake disadvantages include poorer heat dissipation and less fade resistance than disc brakes. technician b says drum brake disadvantages include lack of self-adjustment without special linkage, and a greater tendency than disc brakes to pull and grab. who is correct?

O A only
O B only
O Both A and B
O Neither A nor B

Answer 1

Both Technician A and B are correct. Drum brakes are known for poorer heat dissipation, less fade resistance, and potential stability issues without proper self-adjustment mechanisms.

Step-by-step explanation:

The correct answer is option Both A and B. Technician A points out that drum brakes have poorer heat dissipation and less fade resistance compared to disc brakes. This is significant because during times of excessive use, such as a truck descending a steep hill, the brakes accumulate heat. The ability to dissipate this heat is critical to maintain braking efficiency and prevent brake fade, where the brakes lose stopping power. On the other hand, Technician B notes that drum brakes can lack self-adjustment without special linkage and might exhibit a greater tendency to pull or grab, which can affect vehicle stability during braking. Modern vehicles often use disc brakes specifically because of their superior heat dissipation and consistent performance under various operating conditions.

Both Technician A and Technician B are correct in stating the disadvantages of drum brakes. Drum brakes have poorer heat dissipation and less fade resistance compared to disc brakes, which means they are more likely to overheat during prolonged or heavy use. They also lack self-adjustment without special linkage and have a greater tendency to pull and grab compared to disc brakes.