The brake/clutch master cylinder reservoir is filled with DOT 3 brake fluid as indicated on the reservoir cap. See Engine Compartment Overview for the location of the reservoir.
There are only two reasons why the fluid level in the reservoir might go down:
Do not top off the brake/clutch fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake/clutch hydraulic system.
Warning
If too much brake fluid is added, it can spill on the engine and burn, if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake/clutch hydraulic system.
When the brake/clutch fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light.
Chevrolet Sonic. Service Publications Ordering Information
Service Manuals
Service Manuals have the diagnosis and repair information on the engines, transmission,
axle, suspension, brakes, electrical, steering, body, etc.
Service Bulletins
Service Bullet ...
Citroen C3. Weights and towed loads
* The weight of the braked trailer can be increased, within the GTW limit, if the GVW of the towing vehicle is reduced by an equal amount. Warning: towing using a lightly loaded towing veh ...
Chevrolet Sonic. Detecting the Vehicle Ahead
The green vehicle ahead indicator will appear when a vehicle is detected ahead.
Whenever this indicator does not appear, FCA will not respond. The indicator may
disappear on curves, highway exit ...