/ Dictionary / Index B brake fluid: Meaning and Definition of Find definitions for: brake' flu"id Pronunciation: [key] — Auto. Auto. the fluid used in a brake system to transmit pressure from the brake pedal to the pistons at each wheel, producing the braking action. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. brake fade brake horsepower Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language