Technician A says that a common cause of parking brakes that will not hold, is out of adjustment slack adjusters. Technician B says that loss of pressure in the secondary circuit can cause poor trailer parking brake performance. Who is correct?a) technician Ab) technician Bc) both technicians A and Bd) neither technician A nor B

a) technician A

Explanation: A parking brake is a secondary and support brake system which is usually applied when the vehicle is not in motion,this is done to prevent any form of motion and the possibility of any form of accident.

A secondary circuit is a circuit or coil in which current is generated through induction from another circuit or coil called the primary circuit,it has not been discovered that a low pressure from that circuit has led to poor trailer parking brake performance.

radiation

explanation:

heat is transmitted by radiation