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Date of Origin – 02/24/11
Updated – 02/03/20
AIR BRAKE SYSTEM - TROUBLESHOOTING GUIDE
CAUTION! Block wheels before servicing trailer air brake sys-
tem. Drain resevoirs before removing air lines, hoses, or valves. Consult
spring brake manufacturer’s recommendations before working on spring
brake chambers.
LEGEND
SRV - SERVICE RELAY VALVE (REFERENCE PG 38 BUBBLE 6)
EV - EMERGENCY VALVE (REFERENCE PG 38 BUBBLE 22)
TPV = TRACTOR PROTECTION VALVE
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