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Revision: B
APPLICATION
Model
DESCRIPTION
It is very important to drain the air tanks in the proper order to confirm the various check valves
and safety valves are functioning properly.
IMPORTANT NOTICE
This procedure provides guidelines on how to drain air tanks. However, please note
that this procedure is not a substitute for similar documents issued by your federal,
state, or provincial transportation authority.
Writer: EL
MAINTENANCE
INFORMATION
DATE:
November 2022
SUBJECT:
AIR TANKS DRAINING SEQUENCE
General update
VIN
ALL PREVOST VEHICLES
MI22-12B
SECTION: 12 BRAKE & PNEUMATIC
<QF7720955 rev 7
12-07-2022
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Summary of Contents for PREVOST MI22-12B
- Page 1 Revision: B General update 12-07-2022 APPLICATION Model ALL PREVOST VEHICLES DESCRIPTION It is very important to drain the air tanks in the proper order to confirm the various check valves and safety valves are functioning properly. IMPORTANT NOTICE This procedure provides guidelines on how to drain air tanks. However, please note that this procedure is not a substitute for similar documents issued by your federal, state, or provincial transportation authority.
- Page 2 MI22-12B Page 2 / 8 SAFETY PRECAUTIONS Eye protection should always be worn when working in a shop. • Rules for Personal Protection Equipment should always be respected. Wear your PPE • including but not limited to the following: Safety...
- Page 3 MI22-12B Page 3 / 8 PROCEDURE FIGURE 1: AIR TANKS LOCATION (LATEST ARRANGEMENT) – REAR END FIGURE 2: AIR TANKS LOCATION (LATEST ARRANGEMENT) – FRONT END Please, refer to your Parts Manual or Maintenance Manual for specific year model tank location Writer: EL <QF7720955 rev 7...
- Page 4 MI22-12B Page 4 / 8 Perform the following air tanks draining sequence. NOTE All air tanks are provided with a bottom drain valve. 1. Raise the vehicle from under the axles or use the chassis hoisting points as the drive axle wheels must remain free to turn.
- Page 5 MI22-12B Page 5 / 8 NOTE Check for any excess water or oil accumulation when draining the Wet tank. If excessive water or oil is found, it needs to be remedied. 5. Confirm Primary and Secondary pressure gauges indicate full pressure, that is above 120 psi.
- Page 6 MI22-12B Page 6 / 8 7. Drain the Secondary tank and then close the drain valve. NOTE Check for any excess water or oil accumulation when draining the Secondary tank. If excessive water or oil is found, it needs to be remedied.
- Page 7 MI22-12B Page 7 / 8 a) Ask the assistant in the driver seat to confirm that the emergency brake does not apply (the control valve knob does not pop out) once the primary tank is drained. This confirms proper functioning of the DC-4 SHUTTLE-TYPE DOUBLE CHECK VALVE.
- Page 8 MI22-12B Page 8 / 8 To use this test, select Air Leakage Monitor in Pre-Trip Assistance menu on your Driver Information Display and follow the instructions displayed. 15. Test the emergency spring brake application. Release the parking brake. Pump the service brake pedal to drop the Primary &...
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