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Service bulletins for the 2021 Freightliner Cascadia

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.

509 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
TechTalk74632020-12-02. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES. Tech Talk discussion on ABS trailer code 520216 31 P4 New Cascadia.
TechTalk74632020-09-30. Service bulletin. SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM. Tech Talk discussion on ABS trailer code 520216 31 P4 New Cascadia.
CONMET DISC BRAK2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Disc Brake Communication for vehicles with flat rotor disc brakes with aluminum hubs may have rotor mounting studs fracture due to hydrogen embrittlement. A hold has been placed on vehicles at plants and facilities to inspect before releasing for delivery.
CONMET HUB COMMU2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Hub Communication on rotor mounting studs installed on steer and drive hubs on vehicles with flat rotors may fracture due to hydrogen embrittlement. Inspection of vehicles may delay delivery of vehicles.
CONMET FLAT ROTO2020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. ConMet Work Instructions for Inspection of ConMet Disc Brake Rotor to Hub Fastener. Please see the attached instructions on inspecting the ConMet disc brake rotor to hub fastener. Rotor mounting studs installed on steer and drive hubs on vehicles with flat rotors may fracture due to hydrogen embrittlement.
CALFTL35-0012020-09-16. Service bulletin. SERVICE BRAKES, HYDRAULIC. Customer Advisory Letter for Inspection of ConMet Disc Brake Rotor to Hub Fastener. Our records indicate that you are the owner of certain vehicles and therefore DTNA is sharing the following documentation with you. Please see the attached instructions on inspecting the ConMet disc brake rotor to hub fastener.
CALFTL54-010REV2020-09-01. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; EQUIPMENT. Revised Customer Advisory Letter for New Cascadia ABS Warning Light Illumination work instructions. Due to the enhanced vigilance of the New Cascadia ABS controller, some fault codes and indicator lights do not necessarily require immediate maintenance attention. DTNA and WABCO are currently jointly working on a long-term corrective plan for the condition. REVISED: This CAL replaces the CAL issued June 17th, 2020. The phrase "if equipped" in reference to cab load disconnect switches has been removed.
SB42-0782020-07-31. Service bulletin. SERVICE BRAKES, AIR:DRUM:SHOES/LININGS; SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM:SHOES/LININGS. Freightliner Service Bulletin for Meritor Steer Axle Drum Brake Squeal. Some Cascadia and New Cascadia 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.
CALFTL54-0102020-06-26. Service bulletin. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT. Customer Advisory Letter for New Cascadia ABS Warning Light Illumination work instructions. Due to the enhanced vigilance of the New Cascadia ABS controller, some fault codes and indicator lights do not necessarily require immediate maintenance attention. DTNA and WABCO are currently jointly working on a long-term corrective plan for the condition.
CALFTL42-0022020-06-26. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES, HYDRAULIC. Customer Advisory Letter for Antilock Brake System (ABS) Modulator Valve Replacement work instructions.
CALABSMODVALVE12020-06-26. Service bulletin. SERVICE BRAKES, HYDRAULIC; SERVICE BRAKES, AIR. Customer Advisory Letter for ABS Modulator Valve Replacement. Provides additional information as announced in CALABSMODVALVE communication.
CALABSMODVALVE2020-05-14. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES, HYDRAULIC. Customer Advisory Letter for ABS Modulator Valve Replacement. DTNA has decided to remove and replace the ABS modulator valves as part of an ongoing supplier quality study.

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