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Service bulletins for the 2020 Western Star 5700

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.

159 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Brakes are shown. Show all

Bulletins, newest first
SBW42-0142020-12-22. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES; EQUIPMENT. Western Star Service Bulletin for Access to Front Brake Zerk Fittings. Certain vehicles with Detroit front axles and Meritor EX-L front air disc brakes do not have access to the front brake zerk fittings for lubrication.
TS10337682020-07-31. 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.
SBW42-0132020-07-31. 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.
CAL_WS_420012019-10-30. Service bulletin. SERVICE BRAKES, AIR; EQUIPMENT. Customer Advisory Letter for WABCO HP air dryer turbo cut-off valve replacement.
SS10345312019-10-30. Service bulletin. SERVICE BRAKES, AIR; EQUIPMENT. Service Solution for WABCO HP air dryer turbo cut-off valve replacement.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.