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TM 9-2330-272-14
4-40. AIR LEAKAGE TEST.
This Task Covers
Test
Initial Setup
Equipment Conditions:
l Wheels chocked
l Semitrailer coupled to towing vehicle with air system
pressurized (para 2-10).
Tools/Test Equipment:
l General mechanic’s tool kit
T E S T
Materials/Parts:
“ Dishwashing compound (Item 7, Appendix E)
Personnel Required: Two
1
Coat air couplings air lines, and fittings with soap and water solution.
2
Have assistant apply and release brakes. Inspect for air bubbles. No leakage is permissible.
3
Tighten any leakinq components or replace defective components as required.
4
Coat relay valve exhaust check valve with soap and water solution. Inspect for leakage. Replace relay valve if
bubble larger than 1 in. (2.5 cm) is present in three seconds.
5
Release brakes and place relay valve in emergency position by disconnecting either towing vehicle air Iine from
semitrailer air coupling.
Coat relay valve exhaust port with soap and water solution. Inspect for leakage
Replace relay valve if bubble larger than 1 in. (2.5 cm) is present In three seconds.
6
Coat air reservior and draincock with soap and water solution. Inspect for leakage. No leakage is permissible
Replace air reservior or draincock if Ieakage is present (para 4-42).
4-75
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