Brake vacuum sensor, manual transmission
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
The brake servo is equipped with a brake vacuum sensor for ensuring brake power assistance even when the engine is switched off. The brake vacuum sensor is located next to the brake servo. The brake vacuum sensor is connected over a separate line.
When the vacuum falls below a specified range the system executes an automatic engine start to generate the required vacuum.
| Item | Explanation |
|---|---|
| 1 | Brake vacuum sensor |
| 2 | two-pin plug connection |
The brake vacuum sensor gives out voltage signals, depending on the vacuum present in the engine control unit.
| Item | Explanation |
|---|---|
| 1 | Voltage |
| 2 | Pressure |
| 3 | Brake vacuum sensor signal shape |
NOTE:
Installation of the brake vacuum sensor depending on the engine version and transmission version
Installation of the brake vacuum sensor depending on the engine version and transmission version. For vehicles without brake vacuum sensor, the vacuum will be determined in the engine control unit based on characteristic curve calculations.
Installation of the brake vacuum sensor depending on the engine version and transmission version. For vehicles without brake vacuum sensor, the vacuum will be determined in the engine control unit based on characteristic curve calculations.