Can Brake Fluid and Power Steering Fluid Be Used Interchangeably?

2 Answers
PaigeDella
07/24/25 8:50pm
Brake fluid and power steering fluid cannot be used interchangeably. Brake fluid lacks the lubricating properties of power steering fluid and cannot effectively protect gear components and bearings. Although both serve as hydraulic transmission mediums, their temperature resistance capabilities differ. Brake fluid, also known as brake hydraulic fluid or brake liquid, is made from refined diesel distillate combined with thickeners and antioxidants. There are three types of brake fluid: mineral oil-based, alcohol-based, and synthetic. Power steering fluid is a medium liquid used in automotive power steering pumps. Through hydraulic action, it makes the steering wheel lighter during turns, thereby reducing the driver's steering effort.
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Katniss
08/11/25 11:18am
I've been driving for twenty years and always pay attention to maintenance. Can brake fluid and power steering fluid be used interchangeably? Absolutely not! Brake fluid is designed to handle extreme pressure and high temperatures, such as preventing boiling during hard braking, while power steering fluid is used for lubricating the steering system with different viscosity. Mixing them can damage seals or cause system failure. Last time, a fellow car enthusiast used the wrong fluid, and the brake pedal went soft, nearly causing an accident. Now, I always follow the manual to choose the specified fluid and replace it every two years—don’t cut corners. Safety comes first; losing control of a car on the highway is a matter of life and death. I recommend car owners regularly check fluid conditions and not take risks lightly.
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