Final answer:
Technician B is correct; in a longitudinally split brake system, one master cylinder piston operates the front wheel brake assemblies, and the other operates the rear wheel brake assemblies.
Step-by-step explanation:
The question refers to a longitudinally split brake system in vehicles. Technician A believes that a "longitudinally split" brake system has each master cylinder piston operating the brake assemblies on opposite corners of the vehicle, whereas Technician B suggests that in such a system one master cylinder piston operates the front wheel brake assemblies, and the other piston operates the rear wheel brake assemblies.
Technician B's definition of a longitudinally split brake system aligns with the conventional layout: one master cylinder piston controls the front brakes, and the other controls the rear brakes. This design enhances safety, ensuring that if one circuit fails, either front or rear brakes will continue to operate and allow the vehicle to come to a stop. Therefore, Technician B is correct in this scenario.