WenmarOpen by Wenmar Pro

Service bulletin SC-334

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10032312
Published by NHTSA2010-03-04
Manufacturer's numberSC-334
Manufacturer's date2008-01-11
NHTSA componentSERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

NHTSA's summary

MACK TRUCK: IT HAS BEEN DETERMINED THAT THE 90 DEGREE SINGLE CHECK VALVE FITTING MANUFACTURED BY PARKER HANNIFIN CORP. WHICH IS USED IN THE SUPPLY PORT OF THE SPRING BRAKE MODULATING RELAY VALVE (BENDIX SR 7 VALVE) MAY HAVE A DEFECT WHEREBY THE VALVE BODY RETAINER MAY BECOME EXCESSIVELY WORN AND EVENTUALLY BREAK APART. MODELS CXU, CXP, CXN, CHU, CHN, GU, CTP, CT, CV, MRU, AND LEU. 1/1/04-11/3/05 AND 5/2/07-7/26/07. *PE

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
MACK CHN2004, 2005
MACK CHN2007
MACK CHU2007
MACK CT2004 to 2005
MACK CT2007
MACK CTP2007
MACK CV2004 to 2005
MACK CV2007
MACK CXN2004 to 2005
MACK CXN2007
MACK CXP2007
MACK CXU2007
MACK GU2007
MACK LEU2007
MACK MRU2007

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20072782007-08-28. Brakes
07V3610002007-08-15. SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE
07V3600002007-08-15. PARKING BRAKE
20072652007-08-14. Brakes
20072642007-08-14. Brakes
06V3670002006-09-26. SERVICE BRAKES, AIR
20062312006-09-19. Brakes
06V2710002006-07-26. SERVICE BRAKES, AIR
20061802006-07-17. Brakes
06V2320002006-06-28. PARKING BRAKE:CONVENTIONAL:AIR

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CBR 407 0720252025-08-04. Service bulletin. CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
CBR-407 2024092024-10-03. Service bulletin. CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
KC-5932022-05-05. Service bulletin. V-MAC - ABS Malfunction Lamp On - ( Eaton ABS Active Code 17-10 / Arvin Meritor Wabco Active Code 7-4 )