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Technical

Bulletin No: TCH-013-017

Protect Your Bendix

Subject:

De-icing Chemicals

Vehicles exposed to harsh winters, de-icing and/or

other chemical sprays, often experience excessive

corrosion and contamination.

vehicles typically need maintenance more often,

and vehicle parts exposed to de-icing chemicals

tend to require replacement sooner. For air system

components, one potential result of exposure to

corrosion and contamination can be restricted or

blocked exhaust ports which can reduce air system

performance.

Regular maintenance routines typically include in-

spections for corrosion and contamination. Air control

valves with smaller secondary exhaust ports, such as

the Bendix

ATR-1

™

or ATR-2

and R-14

relay valves (See Figure 1), are especially

important to check. These valves are often situated

in difﬁ cult-to-reach locations on the vehicle, however,

by following the steps outlined in this Bulletin, the

technician can verify that the valves are functioning

correctly.

Bendix recommends that potentially affected

vehicles:

•

Use the speciﬁ c test(s) below to determine if the

valves are functioning properly

•

Install air system components in areas protected

from direct splash and road spray, and install splash

guards where necessary

•

Have more frequent inspection and maintenance

schedules in regions that have greater exposure

to de-icing chemicals

Early indications that maintenance is required include

reports of "brake drag" — that service brakes appear

to be slow to release following a braking or traction

control event.

When conducting the following Tests, follow all industry

standard safety guidelines, including, but not limited to,

those shown on page two of this Bulletin.

In all cases, consult your vehicle manufacturer's

service manual for details of any further tests that they

recommend.

To Test ATR-1

™

and ATR-2

Valves:

The antilock traction control (ATC) system is tested

by connecting the vehicle to a PC with the Bendix

Effective Date: 7/30/08

™

ATR-1

, ATR-2

As a result, these

™

traction control valves

™

Traction Relay

Bulletin

Cancels: N/A

™

and R-14

Secondary Exhaust Ports (With Cover) are

Located Behind the Mounting Bracket

Relay Valve Exhaust Port

FIGURE 1 - EXAMPLES OF R-14

ATR-1

™

AND ATR-2

™

ACom

diagnostics program loaded. (ACom

software is available as a free download from www.

bendix.com). Run the ATC Valve Test provided in

ACom

™

diagnostics, and verify that the brakes are fully

releasing after the ATC event. If the brakes are slow

to release, replace the traction relay valve and repeat

the above check.

To Test R-14

Relay Valves:

Visually inspect (where possible) that the balance

exhaust port cover is present on the relay valve; in

cases where the cover is missing, replace the entire

valve with a new valve. During installation, conﬁ rm

that the exhaust cover is ﬁ rmly attached.

If the cover is present, verify that the R-14

used is functioning properly by fully charging the air

system and block and hold vehicle by means other than

the air brakes. Then make several brake applications

and check for prompt application and release of each

wheel's brakes with no perceptible lag.

If the brakes are slow to release, replace the relay valve

and repeat the above test. If the brakes continue to

exhibit slow release, refer to the troubleshooting section

in your vehicle manufacturer's service manual.

Page: 1 of 2

Relay Valves from

R-14

Relay Valve

Cover for Balance/

Quick Exhaust Port

(Used for Anti-

Compound Functions)

Relay Valve Exhaust Port

RELAY VALVE AND

TRACTION RELAY VALVES

relay valve

™