Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Brake fluid level switch
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 |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.