The RED brake warning light is on. Technician A says this could be caused by a sticking parking brake switch. Technician B says that one or both front and rear brake systems have failed. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B c - Both technicians are right. Technician A is right because an out of adjustment parking brake or sticking switch will turn on red warning light. Technician B is right because failure of either the front or rear brake system causes and excessive imbalance in the system turning on the RED brake light.