# Service bulletin 422

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10020436
- Published by NHTSA: 2006\-10\-04
- Manufacturer's number: 422
- Manufacturer's date: 2006\-05\-01
- Replaces: 422
- NHTSA component: SERVICE BRAKES, AIR:SLACK ADJUSTERS:AUTOMATIC

## NHTSA's summary

AUTOMATIC SLACK ADJUSTER ADJUSTMENT CAUTION. MODELS CONSTELLATION AND HERITAGE. WESTERN STAR. \*KB

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Brakes

## Vehicles listed

- 2014 WESTERN STAR 5700
- WESTERN STAR CONSTELLATION
- WESTERN STAR HERITAGE

## Recalls for the same vehicles and component

- [2017583](/recalls/tc/2017583.md), 2017-11-28: Brakes

## Other bulletins for the same vehicles and component

- [TS1033768](/bulletins/10177689.md), 2020-07-31, Service bulletin: SERVICE BRAKES, HYDRAULIC. Training Solution for Western Star Front Brake Squeal \- Burnishing Procedure. The brake burnishing procedure can be used to help reduce brake related noise or imbalance concerns which may occur in the field.
- [SBW42\-013](/bulletins/10177607.md), 2020-07-31, Service bulletin: SERVICE BRAKES, AIR:DRUM:SHOES/LININGS; SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM:SHOES/LININGS. Western Star Service Bulletin for Meritor Steer Axle Drum Brake Squeal. Some Western Star 5700 vehicles equipped with Meritor steer axle drum brakes with a front axle rating less than 13,300 lb \(6038 kg\) have experienced brake squealing noise when the service brakes are applied at lower speeds. NOTE: This is a nuisance noise issue and not a failure. The solution given in this service bulletin may fix this issue.
- [sbw54067](/bulletins/10163579.md), 2019-08-07, Service bulletin: SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP. Service Bulletin sent out to customers regarding ABS solenoids not doing self check. Correction of this failure involves installing a relay jumper assembly.
- [sbw54066](/bulletins/10153389.md), 2019-02-19, Service bulletin: SERVICE BRAKES, AIR:SUPPLY:LOW PRESSURE WARNING:SWITCH. ICU4Me Low Air Pressure Warning Change
- [DOC\-1033768](/bulletins/10151530.md), 2018-12-10, Service bulletin: SERVICE BRAKES. TS 1033768: Western Star Front Brake Squeal \- Burnishing Procedure
- [FL756](/bulletins/10146288.md), 2018-10-29, Service bulletin: SERVICE BRAKES, HYDRAULIC; SERVICE BRAKES, AIR; ELECTRICAL SYSTEM. Brake Light Pressure switch may not activate the brake lights with a light application of the brake pedal.
- [ssbw42010](/bulletins/10141826.md), 2018-06-18, Service bulletin: AIR BAGS; SERVICE BRAKES. ssbw42010 Inspección de fugas de aire del transportista concesionario
- [DOC\-1033322](/bulletins/10140704.md), 2018-06-11, Service bulletin: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE. SS 1033322 ABS light illuminating in ICU, ABS solenoids will not self\-check

JSON: [/v1/bulletins/10020436](/v1/bulletins/10020436)

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