BMW 328D 2014–2015 — technical service bulletin
Bulletin B340415 · NHTSA communication 10151410 · issued Aug 1, 2015
Technical service bulletin
communication type
Service Brakes
component
2014–2015
model years
8
vehicle entries
Official 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).
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.