The protective film which covers the 6 threaded connection holes on the DSC hydro unit may not have been...
BMW technical service bulletin B340226 for 2026 BMW 430I.
- Bulletin number
- B340226 (0034410300)
- Component
- Service brakes
- Summary
- The protective film which covers the 6 threaded connection holes on the DSC hydro unit may not have been completely removed before the brake line was fastened. This can lead to a gradual loss of brake fluid at the threaded connection. As a result, the driver is alerted at an early stage by a red Check Control Message stating “Brake system defective. Stop carefully. Do not continue driving. Call BMW Roadside Assistance”. However, there is no functional limitation of the brake.
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