Hearth Record

Service brakes, air: disc: chamber; service brakes, air (Peterbilt)

Vehicle recall 21V-328. NHTSA received PACCAR Incorporated’s report on May 10, 2021.

NHTSA’s own record, on nhtsa.gov

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The short answer

NHTSA received PACCAR Incorporated’s report on May 10, 2021. Copied from NHTSA on Oct 19, 2026.

Every line below is in NHTSA’s own words, with its source beside it.

What’s wrong with it?

The pressure plate may tear the diaphragm, causing a loss of air pressure and increasing the risk of a crash.

PACCAR Incorporated (PACCAR) is recalling certain 2021 Peterbilt 348 and 579 vehicles.

The spring brake chamber may have been assembled with incorrect springs that were out of specification, which may cause the pressure plate to shift.

Source:

NHTSA, Recalls flat file. Released Oct 19, 2026. Updated daily.

  • NHTSA’s part: Service brakes, air: disc: chamber.
  • NHTSA’s part: Service brakes, air.

What should you do?

Dealers will replace brake chambers, free of charge. Owner notification letters were mailed on July 9, 2021. Owners may contact PACCAR (Peterbilt) customer service at 1-940-591-4220. PACCAR’s number for this recall is 21PBE.

Source:

NHTSA, Recalls flat file. Released Oct 19, 2026. Updated daily.

  • How to reach the firm: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to 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 13 vehicles potentially involved, across everything this recall names.

Each model year opens its own page: every recall naming it, its owner complaints and its crash ratings.

Source:

NHTSA, Recalls flat file. Released Oct 19, 2026. Updated daily.

Who is recalling it?

  • Made by PACCAR Incorporated.
Source:

NHTSA, Recalls flat file. Released Oct 19, 2026. Updated daily.

What the record doesn’t say

  • NHTSA’s recall file doesn’t say whether anyone was hurt. Owners’ complaints are counted on each vehicle’s page.
  • Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
  • How many have been returned or fixed isn’t in the notice.
Source:

Hearth Record wrote these lines.

Sources

  • National Highway Traffic Safety Administration, Recalls flat file (FLAT_RCL_POST_2010).

    Released Oct 19, 2026 and checked Oct 19, 2026. Updated daily. Public domain (U.S. Government work).

Source:

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 19, 2026.

How to read a record

Four things every record does, shown on an example record made up for this guide.

An example record, made up for this guide

An example nursing home

Made up for this guide: no real place is shown

Not fully inspected in over two years (CMS flag)

11 health citations at the latest inspection cycle

The state average is 14.3.

Source:

CMS, State and US Averages and Health Deficiencies. Released Oct 28, 2026. Updated monthly.

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Every fact names its source.

Who published it, when, and how often it changes sit beside each fact, with a link to the agency’s own file.

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