TM 9-2320-364-102-74 Table 2-1. Operators Preventive Maintenance Checksand Services (Before) - CONT.LocationItemNo.IntervalItem toCheck/ServiceProcedureNot Fully MissionCapable if:Before performing the next step, ensure that no personnel are in frontof truck. Be ready to apply the service brake. Operator must remain in cab while performing this check to prevent possible serious injury or death to other personnel.NOTE∑Check trailer brake hand control only if a trailer is attached to the truck and truck air lines are attached to trailer air lines or test will not be correct.∑Ensure air pressure is between 110 to 125 psi (758 to 861 kPa).11BeforeControlsandIndicators -Cont.(x) Check operation of trailerhandbrake control (34).(1) With engine at idle, applyservice brake pedal (27).(2) Engage transmission rangeselector to Drive (D).