# Service bulletin 21PBE

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: 10198814
- Published by NHTSA: 2021\-07\-06
- Manufacturer's number: 21PBE
- Manufacturer's date: 2021\-06\-30
- NHTSA component: SERVICE BRAKES, AIR

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198814-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198814-9999.pdf)

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

## Components

Brakes

## Vehicles listed

- 2020 PETERBILT 348
- 2020 PETERBILT 579

## Recalls for the same vehicles and component

- [21V906000](/recalls/nhtsa/21V906000.md), 2021-11-19: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR

## 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.
- [21PBM](/bulletins/10206090.md), 2022-01-06, Service bulletin: SERVICE BRAKES, HYDRAULIC. 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.
- [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

JSON: [/v1/bulletins/10198814](/v1/bulletins/10198814)

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