1. Locate the brake fluid reservoir. In the Renault Clio, the brake fluid reservoir is located in the engine compartment, on the driver's side near the firewall.
2. Check the brake fluid level. The reservoir has a "MIN" and "MAX" line, and the fluid level should be between these two lines.
3. If the fluid level is low, add brake fluid until it reaches the "MAX" line. Use only DOT 4 brake fluid, as specified by the manufacturer.
4. Close the brake fluid reservoir cap tightly.
Note: It is important to check the brake fluid level regularly, as it can decrease over time due to evaporation and wear of the brake pads. Low brake fluid level can affect the performance of your brakes and can be dangerous.
