![brake fluid brake fluid](https://www.tekportal.net/wp-content/uploads/2019/01/brake-fluid.jpg)
brake fluid noun Automotive.
- the fluid used in a brake system to transmit pressure from the brake pedal to the pistons at each wheel, producing the braking action.
British Dictionary definitions for brake fluid brake fluid noun
- an oily liquid used to transmit pressure in a hydraulic brake or clutch system