Technician A says that drum servo brakes are self-energizing.Technician B says that servo brakes both primary and secondary shoes play a role in braking the drum whether the vehicle is moving forward or in reverse.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Drum Servo Brakes

A type of brake system that uses a servo mechanism to amplify the force applied by the driver, improving braking efficiency especially in heavy vehicles.

Self-energizing

Referring to a mechanism that uses the motion or force of its operation to increase its effectiveness without needing an external power source.

Secondary Shoes

Components of a drum brake system positioned to assist in braking, usually having less wear than primary shoes.