There may be an internal leakage in the brake fluid expansion tank (aka brake fluid reservoir)
BMW technical service bulletin B340925 for 2024-2026 BMW 330I, 2024-2026 BMW M3 and 2024-2026 BMW 430I and others.
- Bulletin number
- B340925
- Component
- Service brakes
- Summary
- 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.
Owners of these vehicles have filed 4 complaints in the brakes category.
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