NHTSA ID Number: 10046783
Manufacturer Communication Number: WSB-42-05
TSB/Document Date: 2012-10-24
Summary
WESTERN STAR
: AN ISSUE WITH THERMAL OVERLOAD ON BENDIX AIR DISC BRAKES WHERE ABS SENSOR WIRES MELTS, BRAKE ACTUATOR FAILS TO PROPERLY OPERATE DUE TO VENT HOLE IN BOTTOM NOT OPENING, CALIPERS COATED WITH RED OR BRIGHT ORANGE DUST AND TAPPED AND/OR GUIDE PIN BOOTS MELTED OR OTHERWISE SHOWS HEAT DAMAGE. MODELS CONSTELLATION, 4700, 4800, 4900, 5900 AND 6900. NO MODEL YEARS LISTED. *PE
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- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: WSB-42-05
Replacement Service Bulletin Number:
MFR Communication Date: 2012-08-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, AIR:DISC:CALIPER
MFR Component System:
MFR Component Subsystem:
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SB-10046783-2136
42-05
Bendix® Air Disc Brake Thermal Overload Issues
> Constellation
Heritage
> 4700 Models
> 4800 Models
> 4900 Models
> 5900 Models
> 6900 Models
Western Star
Service Bulletin
General Information
Several issues are being reported related to thermal overload on Bendix air disc brakes. They include, but are
not necessarily limited to, the following:
• The calipers are coated with a bright orange or red colored dust.
• The tappet and/or guide pin boots on the affected wheel end is melted or otherwise shows evidence of
heat damage.
• The ABS sensor wires are melted.
• The brake actuator failed to operate properly because the bottom vent hole is not open.
Foundation brakes are designed and intended to stop a vehicle by converting its kinetic energy (energy of motion) into heat. An air disc brake by design, can, and will, run at higher temperatures and cool off faster than the
drum brakes traditionally used on heavy vehicles. Also, in standard operation, air disc brakes will often have
differences in temperature at wheel ends on the same axle. The temperatures generated will depend on the vehicle configuration, vocation, and brake usage.
In the event that any of the above issues are found, or any thermal overload is suspected, immediately contact
Bendix Technical Help Line: 1-800-AIR-BRAKE, (1-800-247-2725) and select option 2, then option 1, Mon.
- Fri., 8 a.m. - 6 p.m. EST. for information on how to remedy these issues. Or go to the on-line document library at www.bendix.com for free downloads of Service Data Sheets and warranty policies. BW7514b is the
document covering the thermal overload issue.
Warranty
This bulletin is informational only. Warranty does not apply.
Western Star Service Bulletin, August 2012
Page 1
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