BENDIX TCH-003-048 Manual de usuario descargar pdf (Pagina 2)

Bulletin No: TCH-003-048 Effective Date: 10/4/05 Cancels: N/A Page: 2 of 3

If no evidence of water or contamination is found in

any of the valves or hoses, follow the braking system

inspections shown in Section B.

Section A. Trailer or dolly air brake systems

with evidence of water or contamination

Once water or contamination has entered into any

of the air brake components (for example through

the exhaust valves, etc.), removal of all the water or

contamination is not possible without total

disassembly of the components. Therefore Bendix

recommends that all pneumatic air brake

components be replaced (including the air

reservoir(s), relay valves, spring brake valves, ABS

relay-modulators, and brake actuators). This action

is necessary to avoid any immediate or future

operational issues as a result of internal corrosion

and water migration. Replace any trailer system air

dryer present. Also, for ABS system checks, see the

“ABS Systems” section below.

See “General” subheading below for hose cleaning/

replacement recommendations.

Section B. Trailer or dolly air brake system

with no evidence of water/contaminants

found.

Trailer/Dollies with only limited exterior exposure to

fresh water can be returned to service after having

their air brake system thoroughly tested. Include

checks to verify that the parking and emergency

brakes apply and release and that the reservoirs

charge with minimal leakage (See General section

at the end of this Bulletin for details of a leakage

test). Also check that the application and release of

the trailer and dolly service brakes occurs with no

perceptible lag through the full range of normal

service brake applications. Replace any non-

functioning valves.

For ABS system checks, see “ABS Systems” section

below. Vehicles with normally-functioning air brake

systems can be returned to service. Be sure that

towing vehicles have regularly-serviced air dryers to

aid in removing any residual moisture from the trailer

or dolly system.

In addition, all reservoirs should be pressurized and

then slowly drained using their drain valves to remove

any contents. After 30 days retest the vehicle.

30 DAY RETEST

Bendix recommends that trailers and dollies

that do not show any internal evidence of water

or contamination be retested 30 days after the

vehicle has been returned to service. Bendix

recommends that the vehicle be re-tested for

operation, leakage, and contamination, and that

a diagnostic check of the ABS system be carried

out (see below). Use diagnostic software (e.g.

Bendix

ACom5

™

PC-Diagnostic Software) to look for

any present or intermittent trouble codes stored in

the ABS ECU. Any air brake components found

inoperative should be replaced.

ABS SYSTEMS

ABS systems on trailers and dollies are comprised

of an ABS wire harness, wheel speed sensors, and

an Electronic Control Unit (ECU) — in many cases

with an attached relay/modulator valve assembly

(see above for air brake valve inspections).

ABS System Physical Inspection. Inspect ABS

harnesses for damage, cuts, chafing, etc. and

replace as necessary (Bendix does not recommend

repairing or splicing harnesses).

Since the action of floodwaters and power-washing

may move the ABS wheel speed sensors from their

normal position close to the exciter (tone) ring, push

(by hand) each of the wheel speed sensors until they

contact the exciter ring. Normal wheel bearing play

will adjust the sensor position when the wheel turns.

When replacing ABS wheel speed sensors, either

because of damage, or as a result of electronic

diagnostic checks (see below), follow carefully the

lubrication and re-installation instructions in the

instruction sheet that is included with the replacement

sensor (or, if available, you may use BW-120-A).

Whenever a wheel speed sensor is removed from

its mounting block, Bendix recommends that the

sensor clip be replaced.

ABS System Electronic Inspection.

Unless damaged, Bendix

ABS trailer or dolly-

mounted ECUs are normally “weatherproof” and are

not affected by water or most types of contamination.

Attach the trailer or dolly to a towing vehicle and

power up the system. Note any ABS indicator lamp

diagnostic codes. As necessary, use diagnostic

software (e.g. Bendix

ACom5

™

PC-Diagnostic

Software) to look for any present or intermittent

trouble code history stored in the ECU. Replace

components as necessary.

GENERAL

Bendix recommends that standard operator pre-trip

inspections to ensure proper air brake system

operation be rigorously performed for all vehicles

potentially impacted by flood conditions.

1 2 3

Technical Bulletin 1
ABS SYSTEMS 2

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