TEST OR INSPECTION
23. THERE IS CONTINUOUS BLOW FROM THE EXHAUST WITH THE HANDLE IN RELEASE POSITION. (cont)
Step 2. Check to see if the brake cylinder pressure will approach main reservoir pressure in APPLICATION
position of the independent brake valve.
Replace O-ring in the independent brake valve (center O-ring) (para 4-12).
A-1 CHARGING CUT-OFF PILOT VALVE
24. THERE IS CONTINUOUS SANDING.
Check to see if there is air leaking from the sanding choke.
Replace O-ring on the actuating piston of the A-1 charging cutoff pilot valve (2nd O-ring from top) (para
6-NFR DISTRIBUTING VALVE
25. AUTOMATIC BRAKE CYLINDER PRESSURE FAILS TO DEVELOP OR APPLIES AND REDUCES TO ZERO.
Step 1. Check to see if there is a blow of air at port 9 of H-5 relay air valve.
Repair or replace H-5 relay air valve seat that is leaking (port 11 to port 9) (para 4-16).
Step 2. Check to see if there is a blow of air at brake valve exhaust cavity.
Repair or replace pipe 12 check valve seat that is leaking.
Step 3. Check to see if there is a blow of air at safety valve.
Repair or replace safety valve seat that is leaking, (para 4-13).
Step 4. Check to see if there is a blow of air at application piston exhaust during application.
Repair or replace leak in application valve diaphragm (para 4-13).
Step 5. Check to see if there is a blow of air at independent brake valve exhaust.
Repair or replace No. 24 double check valve (port 20) (para 3-54).