two technicians are discussing vacuum brake boosters. technician a says that when the engine is running and the driver's foot is off the brake pedal, a vacuum is present on both sides of the booster diaphragm. technician b says that when the brakes are in the applied position, vacuum is present on the front side of the diaphragm. which technician is correct?

Using the concepts of Vacuum brake booster, we got both technician are saying correctly about vacuum.When we talk about technician A, we got that the power brakes are designed so  that they use the power from the engine to increase braking efficiency and reduce  driver’s pedal effort. Now, when the brakes are applied, a little vacuum is  formed on both sides of the booster and as a result the atmospheric pressure pushes on and it also moves the diaphragm.In this case, in vacuum suspended unit when the brakes of the system are on the piston and the diaphragm both have atmospheric pressure on its both sides. Therefore we can say that it’s the atmospheric pressure which is on both sides of  piston and diaphragm.When we talk about technician B ,we got thatWhen the brake pedal is released, an internal vacuum port is open which actually allows engine vacuum to flow from check valve to both sides of the diaphragm. With equal pressure (vacuum) on the both sides, the diaphragm is held to the rear by spring pressure.Hence, both technician are saying correctly in different context.To know more about  Vacuum brake booster, visit here:https://brainly.com/question/14318001#SPJ4