4-22. AIR SYSTEM - Continued
Using illustration as a guide, install connectors in valve ports. Coat all threads with pipe sealant (item 22,
Appendix E) prior to installation.
Install relay valve on truck using capscrews and locknuts
Install air line A, B, and C. Be sure they are installed In the same ports as noted in step 2 of REMOVAL
While applying foot brake, brush exhaust port with soap solution. A 1 in. (2.5 cm) bubble In 3 seconds
leakage is permitted.
While applying foot brake, brush body and connectors with soap solution. No leakage is permitted.
Make several brake applications and check for prompt application and release of the relevant (front or
The quick release valve can only be repaired if it is removed from the truck, see REMOVAL
Remove four screws (5) from body (4)
Lift off cover (1) and diaphragm (3)
Remove O-ring (2) from cover
Discard the O-ring (2) and diaphragm (3)
Install new 0-ring (2) in cover (1) Install
diaphragm (3) In body (4) Lay cover
carefully over diaphragm
Install screws (5) and tighten to 30 - 60 in.
lb (3.39 - 6.78 Nm)
(7) Install and test in truck as detailed in