TM 5-3805-258-24-1SYSTEMS OPERATIONOPERATOR’S STATIONINDIVIDUAL CIRCUIT DESCRIPTION3. Indicator, Master Fault Light and Fault AlarmA. Low Brake Air PressureThe brake air pressure circuit is activated by the normally open 9G8009Pressure Switch that measures air pressure. It is closed if the pressure is above517 kPa (75 psi), but if the pressure goes below 448 kPa (65 psi), the switchopens and the brake air pressure indicator on the operator panel turns ON. Theoperator panel also sends current to turn ON the master fault light and, if thefuel pressure switch is open (engine running), sends current to activate the faultalarm.LOW BRAKE AIR PRESSURE SWITCHLOW BRAKE AIR PRESSURE INDICATOR1. Low brake air pressure switch.2. Brake air pressure indicator.Brake Air Pressure Circuit3-157
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