Brake Shimmy–Meritor® SteeLite X30™ Brake Drum With
Excessive Runout
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Heritage
> 4700 Models

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42-6
Western Star
Service Bulletin

Description of Revisions: This bulletin replaces the version dated
May 2012. The cause code in the "OWL VMRS Codes and Labor
Allowance" table is updated.

General Information
NOTE: This bulletin applies only to vehicles equipped with Meritor SteeLite X30 front brake drums.
Some vehicles equipped with Meritor SteeLite X30 front brake drums exhibit moderate to severe shake or
shimmy when the brakes are applied. Most reported occurrences have been during light to moderate brake application, with the speed decreasing from 60 to 40 mph (97 to 64 km/h). Brake lining has been eliminated as a
contributing factor. Meritor SteeLite X30 drums returned to Daimler Trucks North America (DTNA) exhibit excessive runout. Both Meritor and DTNA test departments have found that installed runout over 0.010 in (0.25 mm)
causes shimmy.

Procedure
1. Park the vehicle on a level surface, shut down the engine, and set the parking brakes. Chock the rear tires.
2. Verify that the vehicle is equipped with Meritor SteeLite X30 brake drums.
If the vehicle does not have Meritor SteeLite X30 brake drums, this bulletin does not apply.
If the vehicle has Meritor SteeLite X30 brake drums, go to the next step.
3. Check the front wheel nuts for proper torque. For instructions, see Group 40 in the vehicle’s workshop
manual.
4. Raise the vehicle’s front axle, and place it on appropriate jack stands.
5. Using a dial indicator, check the radial runout on the braking surfaces of the front brake drums.
If the runout on either drum is greater than 0.010 in (0.25 mm), replace the drums and brake linings on both
axle ends.
If the runout on both drums is less than 0.010 in (0.25 mm), check for other issues that may be causing the
shimmy.
6. If replacing the drums, replace the brake linings prior to installing the new drums. For instructions, see
Group 42 of the vehicle’s workshop manual.
7. Replace Meritor SteeLite X30 brake drums with a ConMet® brake drum. Refer to Table 1 for replacement
parts. For instructions, see Group 33 in the vehicle’s workshop manual.
8. Check for incorrect hub-to-drum fitting or debris between the hub and drum.
9. Install the wheels and tires. For instructions, see Group 40 in the vehicle’s workshop manual.
10. Using a dial indicator, check the radial runout on the braking surfaces of the newly installed brake drums.
Runout must not exceed 0.010 in (0.25 mm).
11. Raise the vehicle and remove the jack stands. Lower the vehicle.

Western Star Service Bulletin, August 2012

Page 1

42-6

Brake Shimmy–Meritor® SteeLite X30™ Brake Drum With
Excessive Runout

Western Star
Service Bulletin

> Constellation
Heritage
> 4700 Models

> 4800 Models
> 4900 Models

> 5900 Models
> 6900 Models

Parts
See Table 1 for a list of replacement parts available through the PDCs. Lining part numbers previously listed
can be used up if in stock.

Description
Drums
Lining
Reman Linings

Parts
Defective Drum
Manufacturer
Part Number
ROK 53123589
Meritor SteeLite X30
or (TDA 53123589)
N/A
N/A
N/A
N/A
N/A
N/A

Replace With
Manufacturer
Part Number
ConMet CastLite

CM 10005332

ConMet TruTurn

CM 10014756

Meritor Shoe
Meritor Kit
Meritor Kit

TDA SMA12014720QP
TDA KSMA12014720QP
TDA XK12014720QP

Table 1, Parts

Warranty
This procedure is warrantable only if the described condition exists and the repair is performed within the applicable base or extended coverage warranty period. If drums are replaced with runout below .010, warranty does
not apply. If a failure is not found, this procedure is considered preventive and warranty does not apply.
Supplier pre-approval may be required. See Table 2 for requriements.
Supplier Pre-Approval Requirements
Timeframe
Claim Procedure
Failure date is less than or equal to Claim may be submitted to DTNA without supplier authorization if the vehicle is
6 months from the in-service date. repaired as directed in this bulletin.
OnTrac authorization is requried.
Failure date is greater than 6
Document the OnTrac authorization or denial code number, and submit it through
months from the in-service date.
DTNA warranty. Do not use the OnTrac case number.
Table 2, Supplier Pre-Approval Requirements

Normal warranty applies. See Table 3 for QuickClaim damage code and labor allowance information. Refer to
this service bulletin by number at the beginning of the claim comments. See Table 4 for OWL VMRS codes and
labor allowance information. Enter this service bulletin number in the Service Bulletin #: field.

Damage Code
402-001434130

SRT Code
402-5011A

QuickClaim Damage Code and Labor Allowance
Description
Meritor X30 Brake Drum and Lining, Both Sides, R/R

Time: Hours
2.5

Table 3, QuickClaim Damage Codes and Labor Allowance

Primary Failed Part
Brake Drum

OWL VMRS Codes and Labor Allowance
Component
Cause Code SRT Code
Description
Code
Meritor X30 Brake Drum and Lining,
013-001-023
26
402-5011A
Both Sides, R/R

Time: Hours
2.5

Table 4, OWL VMRS Codes and Labor Allowance

Page 2

Western Star Service Bulletin, August 2012