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Can Power Steering Fluid and Brake Fluid Be Used Interchangeably?

2 Answers

Stephen

07/25/25 12:15am

Power steering fluid and brake fluid cannot be used interchangeably as they serve completely different purposes. Brake fluid, also known as hydraulic brake fluid, has a temperature resistance range from -40°C to 288°C and acts as the liquid medium for transmitting braking pressure in a vehicle's hydraulic braking system. Power steering fluid, also referred to as steering gear oil, has a temperature resistance range from -40°C to 170°C and is used in the steering system to transmit hydraulic pressure. The similarities between power steering fluid and brake fluid are: both are hydraulic transmission fluids and have corrosion-inhibiting properties for metals and rubber. The differences between power steering fluid and brake fluid are: lubrication properties differ and temperature resistance varies. Brake fluid is used in vehicles equipped with hydraulic braking systems; it is an essential component of the braking system and is also known as hydraulic fluid or forced oil.

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MicahAnn

08/10/25 3:40pm

When it comes to power steering fluid and brake fluid, as an experienced car enthusiast, I must emphasize: never mix them up! Power steering fluid is specifically designed to lubricate the power steering system, similar to hydraulic fluid, while brake fluid must meet DOT specifications and is engineered to withstand high temperatures to prevent vaporization. Once, a friend of mine tried mixing them, and the rubber seals in the power steering pump swelled and corroded, nearly causing a brake failure and an accident. I recommend car owners regularly check the fluid labels to ensure the correct type is used—for example, DOT4 or DOT5.1 for brake fluid. Simply put, mixing them not only damages seals but also leads to costly repairs and serious risks. For maintenance, always follow the vehicle manual or consult a professional technician. Don’t cut corners for savings—safety comes first when driving.

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