# 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.

- Type: Service bulletin
- NHTSA id: 10206090
- Published by NHTSA: 2022\-01\-06
- Manufacturer's number: 21PBM
- Manufacturer's date: 2021\-12\-02
- NHTSA component: SERVICE 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206090-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10206090-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Vehicles listed

- 2018 to 2021 PETERBILT 389
- 2020 to 2021 PETERBILT 536
- 2018 to 2021 PETERBILT 567
- 2018 to 2021 PETERBILT 579

## Recalls for the same vehicles and component

- [24V915000](/recalls/nhtsa/24V915000.md), 2024-12-09: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
- [2021713](/recalls/tc/2021713.md), 2021-11-19: Brakes
- [21V906000](/recalls/nhtsa/21V906000.md), 2021-11-19: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR
- [2021521](/recalls/tc/2021521.md), 2021-08-20: Brakes
- [21V648000](/recalls/nhtsa/21V648000.md), 2021-08-19: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS
- [21V328000](/recalls/nhtsa/21V328000.md), 2021-05-10: SERVICE BRAKES, AIR:DISC:CHAMBER; SERVICE BRAKES, AIR
- [20V199000](/recalls/nhtsa/20V199000.md), 2020-04-06: SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ELECTRONIC STABILITY CONTROL \(ESC\)
- [2018389](/recalls/tc/2018389.md), 2018-07-24: Brakes
- [18V368000](/recalls/nhtsa/18V368000.md), 2018-06-01: ELECTRONIC STABILITY CONTROL \(ESC\); SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT

## Other bulletins for the same vehicles and component

- [34\-096](/bulletins/10235704.md), 2023-05-05, Service bulletin: SERVICE BRAKES, AIR; ELECTRICAL SYSTEM. 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\-060](/bulletins/10219235.md), 2022-09-06, Service bulletin: SERVICE BRAKES. The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
- [13\-057](/bulletins/10209699.md), 2022-04-05, Service bulletin: EQUIPMENT; SERVICE BRAKES, AIR; EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES, HYDRAULIC. Fix\-As\-Fail – A hill start assist \(HSA\) valve plumbing revision eliminates ice buildup in the HSA valve exhaust in cold weather.
- [21PBE](/bulletins/10198814.md), 2021-07-06, Service bulletin: SERVICE BRAKES, AIR. 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\-031](/bulletins/10182221.md), 2020-11-05, Service bulletin: FUEL SYSTEM, DIESEL; EQUIPMENT; SERVICE BRAKES, HYDRAULIC. 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\-055](/bulletins/10182219.md), 2020-11-05, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; SERVICE BRAKES, AIR. 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\-054](/bulletins/10177935.md), 2020-08-05, Service bulletin: SERVICE BRAKES. Fix\-As\-Fail \- Bendix New\-Gen Lightweight Steer Axle Drum Brake Spider Cracking
- [18PBB](/bulletins/10174764.md), 2020-05-06, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ENGINE AND ENGINE COOLING. 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 PBC](/bulletins/10174762.md), 2020-05-06, Service bulletin: ENGINE AND ENGINE COOLING; SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:ABS WARNING LIGHT. 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\-005](/bulletins/10171021.md), 2020-02-05, Service bulletin: VEHICLE SPEED CONTROL; SERVICE BRAKES. 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.

JSON: [/v1/bulletins/10206090](/v1/bulletins/10206090)

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