TM 9-2330-359-14&P
4-37. AIR LEAKAGE TEST.
This Task Covers: Test
Initial Setup:
Equipment Conditions:
Materials/Parts:
l Semitrailer coupled to towing vehicle with air system
l Dishwashing compound (Item 5, Appendix E)
pressurized (para 2-10).
Tools/Test Equipment:
Personnel Required: Two
c General mechanic’s tool kit
1.
Coat air lines, fittings, and airbrake chamber connections with soap and water solution. Inspect for air bubbles.
No air leakage is permissible.
2.
Tighten any leaking connections or replace defective components as required.
3.
Apply soap and water solution to exhaust check valve on underside of emergency relay valve. Place
emergency relay valve in emergency position by disconnecting either towing vehicle air line from semitrailer air
coupling.
4.
Replace emergency relay valve if air bubble larger than 1 in. (2.5 cm) develops within three seconds (para 4-43).
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