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Bulletin No.: TCH-008-021
High Duty Cycle Vehicles (City Transit Coaches, Refuse Haulers, Etc.)
The maximum discharge line length is 16 feet.
Length
10-16 ft.
If the discharge line length must be less than 10 feet or greater than 16 feet, contact your local Bendix
representative.
System Leakage
Check the air brake system for excessive air leakage using the Bendix "Dual System Air Brake Test
and Check List" (BW1279). Excessive system leakage causes the compressor to "pump" more air
and also more moisture into the brake system.
Reservoir Draining (System Without Air Dryer)
Routine reservoir draining is the most basic step (although not completely effective) in reducing the
possibility of freeze-up. All reservoirs in a brake system can accumulate water and other contamination
and must be drained! The best practice is to drain all reservoirs daily. When draining reservoirs; turn
the ENGINE OFF and drain ALL AIR from the reservoir, better still, open the drain cocks on all
reservoirs and leave them open over night to assure all contamination is drained (reference Service
Data Sheet SD-04-400 for Bendix Reservoirs). If automatic drain valves are installed, check their
operation before the weather turns cold (reference Service Data Sheet SD-03-2501 for Bendix
™
DV-2
Automatic Drain Valves). It should be noted that, while the need for daily reservoir draining is
eliminated through the use of an automatic drain valve, periodic manual draining is still required.
Alcohol Evaporator or Injector Systems
Check for proper operation of these systems by monitoring alcohol consumption for a few days
(Reference Service Data Sheet SD-08-2301 for the Bendix Alcohol Evaporator). Too little means the
system is not receiving adequate protection and too much simply wastes alcohol. As a general
guide, these systems should consume approximately 1 to 2 ounces of alcohol per hour of compressor
loaded time (compressing air). City pick-up and delivery vehicles will operate with the compressors
loaded (compressing air) more while compressors on highway vehicles will be loaded less. These
figures are approximate and assume that air system leakage is within the limits of the Bendix "Dual
System Air Brake Test and Check List" (BW1279). Last but not least, begin using alcohol several
weeks prior to freezing weather to ensure that the system is completely protected. Use only methanol
alcohol, such as Bendix "Air Guard", in evaporators or injectors.
Air Dryers
Make certain air brake system leakage is within the limits stated in BW1279. Check the operation
and function of the air dryer using the appropriate Service Data Sheet for the air dryer.
AD-9
™
Air Dryer
™
AD-4
Air Dryer
™
AD-2
Air Dryer
AD-IP
™
Air Dryer
AD-SP
™
Air Dryer
Trailer System-Guard
34
Appendix B: Continued
Effective Date: 11/1/92
I.D. min.
Other Requirements
½ in.
None
Service Data Sheet SD-08-2412
Service Data Sheet SD-08-2407
Service Data Sheet SD-08-2403
Service Data Sheet SD-08-2414
Service Data Sheet SD-08-2415
™
Air Dryer
Service Data Sheet SD-08-2416
Page: 2 of 2
®
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