# Service campaign B340225

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 campaign
- NHTSA id: 11017082
- Published by NHTSA: 2025\-04\-17
- Manufacturer's number: B340225
- Manufacturer's date: 2025\-04\-03
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

Due to a manufacturing defect, there might be an internal leakage of the brake fluid expansion tank. In therare case that there is a leakage, the filling level sensor might malfunction over a relatively long period oftime .

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017082-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017082-9999.pdf)

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

## Components

Brakes

## Vehicles listed

- 2025 BMW 330I
- 2025 BMW 430I
- 2025 BMW M240I

## Other bulletins for the same vehicles and component

- [B062826](/bulletins/11031899.md), 2026-05-01, Other: SERVICE BRAKES. Brake Hose Return
- [B340925](/bulletins/11026950.md), 2026-01-05, Service bulletin: SERVICE BRAKES. There may be an internal leakage in the brake fluid expansion tank \(aka brake fluid reservoir\). In the rarecase of a leak, the filling level sensor might malfunction over a relatively long period of time.
- [eB340225](/bulletins/11016435.md), 2025-04-03, Service campaign: SERVICE BRAKES. Delivery Stop \- Brake Fluid Expansion Tank

JSON: [/v1/bulletins/11017082](/v1/bulletins/11017082)

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