Service brakes, air: slack adjusters (Kenworth)
Vehicle recall 11V-157. NHTSA received PACCAR INCORPORATED’s report on Mar 7, 2011.
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The short answer
NHTSA received PACCAR INCORPORATED’s report on Mar 7, 2011. Copied from NHTSA on Oct 21, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
IF THE SLACK ADJUSTER HOUSING WERE TO FRACTURE, THE WHEEL BRAKE TO WHICH THE SLACK ADJUSTER HOUSING IS ATTACHED WOULD NO LONGER FUNCTION, WHICH COULD INCREASE VEHICLE STOPPING DISTANCES, AND IF MOUNTED ON THE STEER AXLE, COULD CAUSE THE VEHICLE TO PULL TO ONE SIDE DURING BRAKING, INCREASING THE RISK OF A CRASH.
PACCAR IS RECALLING CERTAIN MODEL YEAR 2011-2012 KENWORTH T270/370, T440/T470, T800, T660, W900 AND C500 VEHICLES MANUFACTURED BETWEEN OCTOBER 18, 2010, AND JANUARY 28, 2011.
CERTAIN CAST IRON SLACK ADJUSTER HOUSINGS, WHICH TRANSMIT BRAKING FORCE FROM THE BRAKE CHAMBER PUSH ROD TO THE BRAKE CAM TUBE, MAY INCLUDE A FLOW NOTCH IN THE HANDLE PORTION OF THE HOUSING DUE TO AN ERROR DURING THE CASTING PROCESS.
A FLOW NOTCH IN THE HANDLE PORTION MAY REDUCE THE EFFECTIVE CROSS SECTION STRUCTURE AND CAUSE THE SLACK ADJUSTER HOUSING TO FRACTURE.
NHTSA, Recalls flat file. Released Oct 21, 2026. Updated daily.
- NHTSA’s part: Service brakes, air: slack adjusters.
What should you do?
DEALERS WILL INSPECT AND REPLACE THE SLACK ADJUSTER HOUSING AS NECESSARY. THIS SERVICE WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON MARCH 30, 2011. OWNERS MAY CONTACT KENWORTH AT 425-828-5440.
NHTSA, Recalls flat file. Released Oct 21, 2026. Updated daily.
- How to reach the firm: KENWORTH SAFETY RECALL. NO.11KWA.OWNERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION’S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV .
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 280 vehicles potentially involved, across everything this recall names.
NHTSA, Recalls flat file. Released Oct 21, 2026. Updated daily.
- Kenworth T270and 2011, before the model years listed here
- Kenworth T470and 2011 and 2012, before the model years listed here
- Kenworth T440and 2011 and 2012, before the model years listed here
- Kenworth T370and 2011 and 2012, before the model years listed here
- Kenworth T170and 2012, before the model years listed here
- Kenworth T800and 2011 and 2012, before the model years listed here
- Kenworth C500and 2011 and 2012, before the model years listed here
- Kenworth W900and 2011 and 2012, before the model years listed here
- Kenworth T660and 2011 and 2012, before the model years listed here
Who is recalling it?
- Made by PACCAR INCORPORATED.
NHTSA, Recalls flat file. Released Oct 21, 2026. Updated daily.
What the record doesn’t say
- NHTSA’s recall file doesn’t say whether anyone was hurt.
- Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
- This recall names only model years before 2015, which have no pages here. Your VIN, at NHTSA, says which recalls are open on a vehicle.
- How many have been returned or fixed isn’t in the notice.
Hearth Record wrote these lines.
Sources
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National Highway Traffic Safety Administration, Recalls flat file (FLAT_RCL_POST_2010).
Released Oct 21, 2026 and checked Oct 21, 2026. Updated daily. Public domain (U.S. Government work).
Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 21, 2026.