brake fluid

American

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.

brake fluid British

noun

an oily liquid used to transmit pressure in a hydraulic brake or clutch system

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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brake fluid

The sun was not quite up as Eric Helera unlocked the doors of his jeepney, wiped down its two long passenger benches, and checked his brake fluid before another day ferrying Manila commuters.

From Barron's ● Mar. 24, 2026

The mechanic informs you that your car’s brake fluid is too low.

From Los Angeles Times ● Sep. 27, 2025

They’re in dental floss, food packaging, brake fluid, you name it.

From Slate ● Apr. 18, 2024

The automakers said internal brake fluid leaks can cause an electrical short that could lead to a fire.

From Reuters ● Nov. 20, 2023

The remedy is replacing one fuse with another, but brake fluid can still leak, potentially causing a safety problem, he said.

From Seattle Times ● Sep. 28, 2023

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023