Technical information

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16
Technician Guidelines for Antilock Braking Systems
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Step 3: Refer to service information.
Vehicle manufacturers provide service procedures which
must be followed to ensure proper repair. Training/service
information is readily available from various sources such as:
• Bulletins
• Service newsletters
• Videotapes
• Service manuals
• Manufacturers’ and dealers’ “Help Line Phone
Numbers”
• Troubleshooting guides
Be sure to confirm that the reference material is applicable
to the specific problem or vehicle being diagnosed. Also, ensure
information is current. Vehicle and supplier manufacturers’
service information—specifically bulletins and newsletters—is
very effective and may help shorten diagnosis.
Hands-on training may also be available from the vehicle/
ABS manufacturer at dealer locations or on site at the fleet. The
Brake Training Resource Directory contains a list of brake
training resources in North America. It is available from the
Office of Motor Carriers, Federal Highway Administration, 400
7th St., S.W., Washington, DC 20590, [phone] or from
The Maintenance Council by calling (800) ATA-LINE or (703)
838-1763.
Step 4: Perform electrical, electronic and air system checks.
Systems checks found in service manuals provide a systematic
approach to identifying the probable cause of a system fault.
This step is important to properly define the correct approach
for the repair and to avoid unnecessary time-consuming
repairs. Additionally, systems checks will help to define what
the problem is not. Systems checks may require the use of original
equipment manufacturer (OEM) service tools and should isolate
a particular component in the system as a probable cause.
i. Electrical diagnostic procedures
Electrical problems are a common cause of ABS faults. It is
beyond the scope of this document to explain electrical
diagnostic procedures for all ABSs and vehicle manufacturers in
great detail. References for diagnosing electrical systems can be
readily obtained from component, vehicle, and test equipment