Question

technician a says the primary shoe of the duo - servo drum brake system is self - energized by the rotation of the drum and this causes the secondary shoe to self - energize as well. technician b says the duo - servo drum brake system is more effective and durable than the leading - trailing brake system. who is correct? a) technician a b) technician b c) both technician a and b d) neither technician a or b

Explanation:

• In a duo - servo drum brake system, when the drum rotates, the primary shoe is self - energized. This action causes the secondary shoe to also be self - energized. So Technician A is correct.
• The duo - servo drum brake system has better braking effectiveness and durability compared to the leading - trailing brake system. So Technician B is also correct.

Answer:

C) Both Technician A and B