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 Reservoir With Level Switch
- Chambers
- Plastic floats
The brake fluid reservoir comprises two chambers (1), one on each brake circuit, which are filled with brake fluid. In the event of a rupture in one of the brake circuits, only some of the brake fluid in the system can escape. The remaining brake fluid acts on the operating brake circuit.
The reservoir contains a level function for detecting brake fluid loss in the brake system. The plastic float (2) floats on the brake fluid. This closes the connector on the switch when the brake fluid level drops below the MIN level on the reservoir. The stop (brake) warning lamp lights on the driver information module (DIM). The float and the switch are integrated with the container and cannot be replaced.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.