Tech A and B are correct about friction and the brake system in the statement given above.
Does brake-by-wire system converts this energy into good work?Friction that exist between brake drums and linings brings a lot of heat, and as such, it also reduces the mechanical energy of the movement of the brake drums and wheels.
Conclusively The brake-by-wire system is known to often uses the electric motor as a form of generator, that helps to reduce the vehicle by changing the car's kinetic energy into electrical energy and as such, both technicians are correct.
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