# Service bulletin 26PACF

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: 11038568
- Published by NHTSA: 2026\-10\-17
- Manufacturer's number: 26PACF
- Manufacturer's date: 2026\-10\-07
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

Certain Model 548 chassis equipped with tri\-drive brake piping are non\-compliant with Federal MotorVehicle Safety Standard \(FMVSS\) 121 / Canadian Motor Vehicle Safety Standard \(CMVSS\) 121 rearservice brake application, rear service brake release, and trailer gladhand application times. A vehiclethat does not meet these brake timing requirements could present an increased risk of a crash or injury.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11038568-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11038568-9999.pdf)

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

## Components

Brakes

## Vehicles listed

- 2027 PETERBILT 548

## Recalls for the same vehicles and component

- [2026420](/recalls/tc/2026420.md), 2026-09-01: Brakes
- [26V567000](/recalls/nhtsa/26V567000.md), 2026-09-01: SERVICE BRAKES, AIR:CONTROLS:PROPORTIONING RELAY VALVE

JSON: [/v1/bulletins/11038568](/v1/bulletins/11038568)

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