Final answer:
Both Technician A and Technician B are correct; Technician A regarding the valve stem-type TPMS sensors, and Technician B regarding the band-type TPMS sensors, with each technique aimed at avoiding damage to the sensors during tire maintenance.
Step-by-step explanation:
Technician A is correct in stating that pushing a valve stem-type tire pressure monitoring system sensor into the wheel before dismounting a tire can help prevent sensor damage. This type of Tire Pressure Monitoring System (TPMS) has sensors that are susceptible to damage when the tire is being dismounted or mounted. Pushing the sensor into the drop center of the wheel helps protect it from the tire machine's tools.
Technician B, on the other hand, speaks about another type of TPMS sensor, the band-type tire pressure monitoring system sensor. These sensors are indeed mounted outside the drop center of the wheel. The drop center is the area where the tire beads sit, which is lower than the rest of the wheel, allowing for easier installation or removal of the tire. The placement of band-type sensors outside this area means that they are less likely to be damaged during tire dismounting and mounting.
Both technicians offer valuable insights into the handling of different types of tire pressure sensors during tire maintenance. It's important to apply the correct procedure for each type to minimize the risk of damaging these crucial components.