BENDIX BW2677 Fascicule

   

Operation of an Audible 

 

 

 

 

With the ignition on and the system air pressure below  FMVSS 121 requires in cab low pressure warning devices. The

   

and Visual Alarm 

 

 

 

 

60 PSI, there must be a visual alarm and may be an  

driver must be warned if the primary or secondary brake systems

   

 

 

 

 

 

audible alarm in the cab. 

fail.

   

Operation of ABS Warning 

 

 

 

 

The ABS warning lamp should illuminate and extinguish   Non functioning ABS systems can increase stopping distance and

   

Dash Lights 

 

 

 

 

when the ignition is turned on. If the ABS warning lamp   cause vehicle instability. After repairs, some ABS warning lamps will

   

 

 

 

 

 

remains lit, the system is not functional and needs  

remain on until the vehicle is driven over 5 mph.

   

 

 

 

 

 

further diagnosis. Contact the system manufacturer for 

   

 

 

 

 

 

troubleshooting information.

   

Purge Cycle 

 

 

 

 

The air dryer needs to purge at maximum system  

Short purge cycles are an indication of air system leakage or the

   

 

 

 

 

 

pressure. The initial purge of Bendix

®

 air dryers is a  

need for air dryer maintenance. If not repaired, contamination

   

 

 

 

 

 

loud blast of air followed by a slowing escape of air for   will enter the air system.

   

 

 

 

 

 

20 to 30 seconds.

   

Compressor Build-Up Time  

 

 

 

 

The compressor should build from 85 PSI to 100 PSI in   Excessive build times are an indication of a problem in the Supply

   

 

 

 

 

 

40 seconds at maximum engine RPM. 

  

system or excessive system leakage. Excessive build times can

   

 

 

 

 

 

 

cause compressor failure and possible dragging brakes. 

  Dash Air Gauges

  (Requires: 

Supply System Leakage 

 

 

 

 

Build full system pressure, apply the parking brakes, 

Excessive system leakage can cause compressor failure, the air

  Full Pressure, 

 

 

 

 

 

stop the engine and allow the pressure to stabilize. The   dryer to cycle more often, excessive water build up in the

  Engine Stopped,   

 

 

 

 

pressure should not drop on the dash gauges more than  reservoir and can lead to possible dragging brakes.

  Parking Brake 

 

 

 

 

 

2 PSI in two (2) minutes.  

  Applied) 

  

 

 

 

 

  Dash Air Gauges

  (Requires: 

Service System Leakage 

 

 

 

 

Excessive system leakage can cause compressor failure and

  Full Pressure, 

 

 

 

 

 

this test. Build full system pressure, release the parking 

possible dragging of the vehicle brakes. 

  Engine Stopped,   

 

 

 

 

brakes, and stop the engine and allow the pressure to  

  Parking Brake 

 

 

 

 

 

stabilize.  The pressure should not drop on the dash

  Released) 

 

 

 

 

 

gauges more than 4 psi in two (2) minutes. 

   

 

 

 

 

 

BW2677 © 2010 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group.  All Rights Reserved.  Visit www.bendix.com for additional information or talk to your Bendix Account Manager.

Printed on recycled paper