# Service bulletin 20 PBF

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: 10185194
- Published by NHTSA: 2021\-01\-06
- Manufacturer's number: 20 PBF
- Manufacturer's date: 2020\-12\-02
- NHTSA component: PARKING BRAKE; SERVICE BRAKES, HYDRAULIC; ELECTRONIC STABILITY CONTROL \(ESC\)

## NHTSA's summary

Safety Recall: Interim Dealer Notification \- Peterbilt has decided that a condition affecting vehicle stability may exist in certain Model 520 vehicles built from 9/26/2019 through 7/22/2020 with stability control and a spring brake modulator valve \(SBM\) or lift axle. The Stability Control Relay may have been plumbed incorrectly, which could cause a stability event that may actuate the lift axle brakes or modulate the park brake chambers, which could destabilize the vehicle. This bulletin will be updated as soon as an affected chassis list is defined and a repair procedure is developed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10185194-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10185194-9999.pdf)

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

## Components

Brakes, Driver assistance, Parking brake

## Vehicles listed

- 2019 to 2020 PETERBILT 520

JSON: [/v1/bulletins/10185194](/v1/bulletins/10185194)

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