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?

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The Answer of 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?

Technician a Says That a Common Cause of Parking Brakes