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.
Functional description
The brake fluid level switch detects a drop below the required 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. The usual motion of the brake fluid within the reservoir does not generally trigger a Check Control message.
The brake fluid level switch contains a reed contact. The reed contact is closed when the brake fluid level is between the maximum (MAX) and the minimum (MIN). The reed contact opens when the brake fluid level is below the minimum (MIN).
| Item | Explanation |
|---|---|
| 1 | Brake fluid container with brake fluid level switch |
| 2 | Sealing cap |
| 3 | two pin plug connection |
Short circuit or line disconnection cannot be detected on the brake fluid level switch. A line disconnection is interpreted as a brake fluid loss. A short circuit is not detected.
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.