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Technical Bulletin

Bulletin No: Effective Date: Cancels: Page: 1 of

Subject:

TCH-008-042

5-3-2007

N/A

Alcohol in the Air Brake System

Bendix Commercial Vehicle Systems LLC discourages the use of alcohol in the air brake system as a means

of preventing system freeze-up in cold temperatures. Studies indicate that using alcohol and alcohol based

products sold for this purpose removes the lubrication from the components of the air braking system. In

addition, the materials used for the internal seals of the air system components may be adversely impacted

by the residue that some anti-freeze additives leave behind. Both are detrimental to air system component

life expectancy, causing premature wear. Because of this, Bendix

air system components warranty will

be void if analysis shows that alcohol was added to the air brake system.

As stated in Bendix Application Speciﬁ cation BW-110-A, alcohol is not an acceptable substitute for

having adequate air drying capacity. If the air dryer is maintained in accordance with the manufacturer’s

recommended practices and moisture is found to be present in the system reservoirs, more drying capacity

is required. Bendix has several viable options including extended purge air dryers, extended purge tandem

dryers in parallel with common control, and air dryers arranged to provide continuous ﬂ ow as with the Bendix

EverFlow

™

continuous ﬂ ow air dryer module. See page 2 for system schematics.

To address concerns with contaminants in trailer air brake systems, the Bendix

Cyclone DuraDrain

™

water

separator and the Bendix

System-Guard

trailer air dryer are available. Refer to Bendix service data sheet

SD-08-2402 and SD-08-2416 respectively for details.

Bendix has also found some alcohol evaporators, which may be placed in series with a single air dryer, can

be restrictive to the output of the compressor. This restriction can cause excessive compressor discharge

pressures at the head of the compressor. This is especially true when the air induction to the compressor

is pressurized (turbocharged). High head pressures can shorten the life of the internal components of

the compressor and cause higher head temperatures which may lead to carbonization of the compressor

discharge and discharge line.

In order to protect the compressor from these high head pressures, an ST-4

™

safety valve is installed in most

Bendix compressors. If a high head pressure event occurs, the safety valve will open, thereby relieving the

compressor and discharge line of these high air pressures.

As always, follow all recommended safety procedures when performing any service on your vehicle. Caution:

never apply an open ﬂ ame to frozen air lines and valves; instead move the vehicle to a warm building.

Additionally, before removing contaminants refer to RP617A procedure for contaminant removal in the

Technology & Maintenance Council (TMC) Recommended Maintenance Practices Manual.

See attachment.

1 2

Resumo do Conteúdo

Página 1 - Technical Bulletin

Página 2 - High Air Usage Drying Options

High Air Usage Drying OptionsAD-IP™/AD-9™ EverFlow™ Module Assembly Piece No. Model Voltage 801801 AD-IP 12Vdc 801288 AD-IP 24Vd

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BENDIX TCH-008-042 Manual do Utilizador

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