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Vehicle recall 11V157000 · March 7, 2011

Kenworth C500, T370 and 7 more models

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…

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary
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.
Consequence
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.
Remedy
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.
Notes
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.

Recall details

NHTSA campaign
11V157000
Reported to NHTSA
March 7, 2011
Filed by
PACCAR INCORPORATED
Manufacturer campaign
11KWA
Owner notification
March 30, 2011
Vehicles potentially affected
280
Initiated by
the manufacturer
Components
Service brakes, air › Slack adjusters
Recall 11V157000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

Has your Kenworth been repaired?

Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.

NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Kenworth dealer can also check your VIN. Recall repairs are free.