BENDIX BW2677 User Manual

In Cab Air Brake System Device Inspection

Please refer to BW1396 (Air Brake System Troubleshooting) for Troubleshooting Information

Date: Invoice Number: Customer Name:

Completed By:

Brake Requires Needs System Repair or Further Component Check For: OK Adjustment Diagnosis Quoted Symptom Notes/Clariﬁ cation/Impact

Low Pressure Warning Indicator

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. See Dual Circuit Brake System fail.

Troubleshooting (Test 1/Checklist 1)

ABS Dash Light or Lights

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.

Air Dryer

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

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. See Dual Circuit system or excessive system leakage. Excessive build times can Brake System Troubleshooting (Test 1/Checklist 1) 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. See Dual Circuit Brake System Applied) Troubleshooting (Test 2/Checklist 2)

Dash Air Gauges

(Requires: Service System Leakage Apply and hold the service brakes while conducting 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. See Dual Circuit Brake System Troubleshooting (Test 3/Checklist 3)