Brake fluid level switch
WARNING: This page does not describe the selected car, but rather 45 other vehicles, including the 2016 BMW M5, 2016 BMW 550i xDrive, 2016 BMW 550i, 2016 BMW 535i xDrive, and 2016 BMW 535i. However, it is still accessible from the selected car via links, so may be relevant.
The brake fluid level switch detects that the brake fluid level has dropped below the required (minimum) brake fluid level in the brake fluid expansion tank. The DSC control unit sends the signal of the bus system to the instrument panel. The instrument panel issues a Check Control message. Normal movements of the brake fluid (during braking or acceleration) in the brake fluid expansion tank will not normally lead to a Check Control message.
A reed contact is installed on the side of the brake-fluid reservoir. The reed contact transmits an electrical signal if the brake fluid level falls below a specified minimum level. The reed contact is closed while the brake fluid level is above the minimum mark.
| Item | Explanation |
|---|---|
| 1 | Brake fluid expansion tank |
| 2 | Brake fluid level switch |
| 3 | two-pin plug connection |