noun
brake fluid
Automotive term for hydraulic fluid used in brake systems. Often called ブレーキフルード in modern Japanese, but ブレーキオイル is also understood.
ブレーキオイルが減っているので補充してください。
The brake fluid is low, so please top it up.
Variant with interpunct, sometimes seen in technical or product contexts.
More common modern term for brake fluid; ブレーキオイル is an older or less precise synonym.
Loanword from English 'brake oil', though the standard English term is 'brake fluid'.