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Service bulletin 21PBM

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 id10206090
Published by NHTSA2022-01-06
Manufacturer's number21PBM
Manufacturer's date2021-12-02
NHTSA componentSERVICE BRAKES, HYDRAULIC

NHTSA's summary

Safety Recall – Work Brake May Unintentionally Disengage – NHTSA ID: 21V906, TC: 2021-713. The work brake (also known as winch brake) may unintentionally disengage during winching operations, releasing the service brakes, increasing the risk of crash or injury. The VECU software will be updated to correctly set the speed interlock parameter.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

Vehicles listed
PETERBILT 3892018, 2019, 2020, 2021
PETERBILT 5362020 to 2021
PETERBILT 5672018, 2019, 2020, 2021
PETERBILT 5792018, 2019, 2020, 2021

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

Recalls for the same vehicles and component
24V9150002024-12-09. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20217132021-11-19. Brakes
21V9060002021-11-19. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR
20215212021-08-20. Brakes
21V6480002021-08-19. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS
21V3280002021-05-10. SERVICE BRAKES, AIR:DISC:CHAMBER; SERVICE BRAKES, AIR
20V1990002020-04-06. SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ELECTRONIC STABILITY CONTROL (ESC)
20183892018-07-24. Brakes
18V3680002018-06-01. ELECTRONIC STABILITY CONTROL (ESC); SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT

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
34-0962023-05-05. Service bulletin. Fix As Fail – All New Model 579 chassis with Bendix radar opti on may have a harness rub against the radiator that is causing possible damage.
13-0602022-09-06. Service bulletin. The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
13-0572022-04-05. Service bulletin. Fix-As-Fail – A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve exhaust in cold weather.
21PBE2021-07-06. Service bulletin. Safety Recall – TSE Brake Chamber Air Leak – NHTSA ID: 21V328. Meritor brake chambers were built with a misaligned park spring, which may cause a fatigue hole in the diaphragm and an internal air leak. The affected brake chambers will be replaced.
44-0312020-11-05. Service bulletin. Non-safety campaign: Peterbilt has determined that vehicles meeting the criteria below may exhibit interference between the fuel line fittings on the Davco fuel filter and the brake chamber due to insufficient clearance. Repeated contact between the fuel filter fuel line fittings and the brake chamber may cause the fittings to break and leak or may cause canister damage. Model 579/567 vehicles Model Years 2018 and 2019 built between 01/16/2017 and 07/09/2018 equipped with a return fuel heated DAVCO 382 fuel filter, short hood, Set Back Front Axle (SBFA) and one of the following: Front drum brakes Disc brakes with DANA E-Series axles Disc brakes with Meritor MFS20 axles Disc brakes with DANA D2000 axles
13-0552020-11-05. Service bulletin. Fix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles built between January 01, 2017 and July 06, 2020. Torsional vibration may stress the currently-installed brackets and cause them to fail near the bottom of the frame rail.
13-0542020-08-05. Service bulletin. Fix-As-Fail - Bendix New-Gen Lightweight Steer Axle Drum Brake Spider Cracking
18PBB2020-05-06. Service bulletin. Safety Recall Bulletin: Updated with permanent repair path for phase 1 vehicles. The Tractor ABS Lamp May Not Illuminate When ABS Controller Loses Battery and/or Ignition Power. NHTSA recall number is 18V368. Non compliance to FMVSS and CMVSS 121 and 136. Resolution is to Reflash software.
20 PBC2020-05-06. Service bulletin. Safety Recall Interim Bulletin: The Tractor ABS Lamp May Not Illuminate When ABS Controller Loses Battery and/or Ignition Power. NHTSA recall number is 20V199 Non compliance to FMVSS and CMVSS 121 and 136. Resolution is to Reflash software.
36-0052020-02-05. Service bulletin. Information Only - Driver Performance Assistance (DPA) Coasting and Braking Scores Not Incrementing, Stays at 50%. The average score will never change nor create driver assistance popups based upon driver’s actions. A future software update will resolve the issue. This bulletin will be updated when the software update becomes available.