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Drain air line moisture.


Moisture in the air brake air brake: see brake.
air brake

Either of two kinds of braking systems. The first, used by trains, trucks, and buses, operates by a piston driven by compressed air from reservoirs connected to brake cylinders (see piston and cylinder).
 lines of your M939-series truck leads to corrosion. In cold weather, it turns to ice. Both clog the lines and slop air flow to the brakes. Your get-up-and-go won't slow down and stop!

1. Drain all four tanks. Sure, the most water will come from the wet tank, but there can be moisture in all four.

2. Your first impulse will be to drain the four tanks in order, from top to bottom. That won't work here. Instead, you must drain the tanks in the sequence listed on Page 2-67 of TM 9-2320-272-10 (Aug 98 w/Ch 2).

To make the order easier to remember, stencil stencil, cutout device of oiled or shellacked tough and resistant paper, thin metal, or other material used in applying paint, dye, or ink to reproduce its design or lettering upon a surface.  the numbers on the truck near the valves. Use black, water dispersible CARC CARC Canadian Arctic Resources Committee
CARC Chemical Agent Resistant Coating
CARC Canadian Agri-Food Research Council
CARC Claim Adjustment Reason Code
CARC Civil Aviation Regulatory Commission (Jordan) 
 paint, NSN NSN National Stock Number
NSN Nokia Siemens Networks
NSN National Storytelling Network
NSN NATO Stock Number
NSN New Substances Notification (CEPA)
NSN National Student Number (NZ)
NSN Never Say Never
 8010-01-493-3182, and a one-inch stencil for the numbers.

3. Open each petcock just long enough to drain the water, then close it. That way you have enough air pressure to drain all four tanks.

[ILLUSTRATION OMITTED]
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Title Annotation:M939-Series Trucks ...
Publication:PS, the Preventive Maintenance Monthly
Date:Dec 1, 2006
Words:162
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