This translucent reservoir is typically found near the firewall on the driver side of the vehicle. This is the fluid that creates the pressure to operate your braking system. The fluid level will gradually decrease as the brake pads wear. The fluid should be light amber in color. Dark fluid is an indication the fluid has reached the end of its useful life and should be replaced before causing damage to the other hydraulic components in the system. Most manufacturers recommend the complete change of fluid on a time-based schedule, typically every two years.