NOTE: A = hydraulic clutch reservoir; B = main circuit tank; C = Auxiliary circuit tank.
| Item name | Spare part number | Description |
| 1 | - | Main outlet |
| 2 | - | Clutch outlet |
| 3 | - | Auxiliary outlet |
The filler neck of the tank has a tight-fitting lid with a level transmitter. The level sensor is actuated by a magnet that is mounted in a float on the bottom of the sensor. The sensor responds to changes in the magnetic field surrounding the magnet.
When the tank is full, the float rests against the bottom of the sensor and keeps the sensor circuit open. When the liquid level drops, the float moves down, as a result of which the sensor closes, connecting the instrument panel circuit to ground. When the circuit is shorted to ground, the instrument panel turns on the red LED in the brake system warning lamp. Vehicles with a high-level instrument panel also display a corresponding warning in the message center display. For more information refer to Instrument Cluster (413-01 Instrument Cluster) At the start of each ignition cycle, the instrument cluster checks the brake status indicator light LED; The indicator lights up for 1.5 seconds with yellow light and then for 1.5 seconds with red light.
Instrument panel transmits brake fluid level status via high speed CAN bus to anti-lock brake system module (ABS). For more information refer to AntiLock Control - Traction Control (206-09A Anti-Lock Control - Traction Control).
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