After Cold Start, Brake Booster Reservoir Vacuum Reduced
BMW technical service bulletin B340415 for 2014-2015 BMW X5, 2014-2015 BMW 328D and 2014-2015 BMW 535D and others.
- Bulletin number
- B340415
- Component
- Service brakes
- Summary
- After Cold Start, Brake Booster Reservoir Vacuum Reduced. With an outside temperature below 14ºF, brake booster vacuum may be reduced after a cold start. The non-return valve in the vacuum line to the brake booster may stick at temperatures below 14ºF. Sufficient vacuum supply is available again at the brake booster only after the vehicle is driven (approximately 1/4 mile).
Owners of these vehicles have filed 12 complaints in the brakes category.
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