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Brake vacuum sensor

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The brake booster is equipped with a vacuum sensor to help ensure that adequate brake-application force will remain available under all conditions. The brake vacuum sensor is located next to the brake booster, to which it is connected by a separate line.

Fig 1: Identifying Brake Vacuum Sensor And Plug Connection
G09841215Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Brake vacuum sensor
2 Plug connection
IMPORTANT: The MSA will respond to inadequate brake vacuum by starting the engine without any action of any kind on the part of the driver. Low brake vacuum can lead to safety risks during braking maneuvers: for instance, when starting on a slope. The engine restarts to rectify this condition.
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