AUTOMATIC BRAKE VALVE (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
Inspect metal parts for cracks, breaks, cuts, or other damage. Replace damaged parts.
Check that springs have not rusted, become distorted, or taken a permanent set. Replace damaged springs.
Refinish faces of rubber check valves by lapping on a piece of medium weight emery paper.
* Drycleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use only
in a well-ventilated area. Avoid contact with skin, eyes, and clothes and don't breathe vapors. Do not
use near open flame or excessive heat. The flash point is 100 138°F (38 59°C). If you become dizzy,
get fresh air and medical aid immediately. If contact with eyes is made, wash your eyes and get medical
* Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Do not direct compressed
air against skin. Use goggles or full face shield.
Do not use metallic tools to clean chokes. The use of metallic tools will change size of chokes, resulting in
failure of brake valve system.
To avoid misplacement of chokes, remove and replace one choke plug at a time.
Clean, inspect, and repair choke plugs by the following:
Remove choke plugs and place in drycleaning solvent.
Inspect choke plug passage for cleanliness. Use compressed air and remove foreign matter.
Remove choke plug from drycleaning solvent and dry with compressed air. Check that choke plug is clean and
Lightly coat threads of choke plug with compound consisting of one part graphite and two parts oil. Install choke