BENDIX SD-08-2414 ユーザーズマニュアル

IMPORTANT:  The Complaints, Causes and Remedies presented here should not be considered as the only situations possible.  

They are only meant to represent the most commonly encountered situations.  It may be necessary to perform additional troubleshooting 

using the more detailed information presented in service manuals for the specific components.

•  Connect a temporary discharge line from the 

compressor discharge port to the supply reservoir 

and re-check the build-up.  If the system build-up is 

OK then replace the plugged discharge line.  If the 

build-up is NOT OK, go to next cause.

•  Verify  the  safety  valve  operation,  then  remove  or 

disconnect the governor from the compressor and 

check build-up.

•  If the build-up is OK, repair or replace the governor or 

the line between the governor and the compressor.

•  If the build-up is NOT OK, repair or replace the  

compressor.

•  Drain all air from the supply reservoir then remove the 

control air line from the air dryer, plug the line and plug 

the control port in the air dryer.  Re-check build-up.

•  If the build-up is OK, repair or replace the governor 

or the line between the governor and the air dryer.

•  If the build-up is NOT OK, and the temperature is 

below 32° F, turn the ignition ON and allow the heater 

to warm the air dryer then check the system build-up.  

If NOT OK, remove the wire (connector or terminal) 

from the air dryer.  Using a test light, check the wire 

end, or terminal, for battery voltage with the vehicle 

ignition ON.  If the voltage is OK, repair or replace the 

air dryer heater and thermostat. If the voltage is NOT 

OK, repair or replace the vehicle wire connected to 

the air dryer. Retest build-up. 

•  If build-up is still NOT OK, or if the temperature 

is above 32° F, replace the air dryer purge valve 

assembly.

•  Build the system pressure to governor cut-out, wait 

two (2) minutes for the air dryer purge completion. 

Note the pressure on the dash gauges then watch 

the dash gauges for two (2) minutes.  The leakage is 

not to exceed 2 psi in two (2) minutes for truck bus 

or tractor (no trailer).

•  If  the  leakage  is  NOT  OK  on  the  gauges,  find  the 

leak(s) in service and park system and repair.  Retest 

and if the system purge air dryer is in use and still not 

OK, repair or replace the dryer.

•  If the leakage is OK on the gauges, drain the air 

from the supply reservoir, remove the drain cock 

and install an air gauge.  Build the system air in the 

supply reservoir and note the leakage.  If OK, continue 

checking.  If NOT OK, find the leaks and repair.

•  Apply  a  soap  solution  to  the  cover  on  the  flexible 

discharge line, if leakage is noted, replace the line.

•  Soap  fittings  to  check  for  leakage  and  tighten  as 

needed.

SD-08-2414 © 2014 Bendix Commercial Vehicle Systems LLC, a member of Knorr-Bremse Group • 9/2014 • All rights reserved.

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