Is Power Steering Fluid the Same as Brake Fluid?
2 Answers
Power steering fluid and brake fluid are not the same, although they share similarities as hydraulic transmission fluids. Their functions differ. The "brake fluid" in a car, also known as "hydraulic brake fluid," serves as the liquid "medium" that transmits braking pressure in the vehicle's hydraulic braking system. Power steering fluid, sometimes referred to as "steering oil" or "steering fluid," is used in the steering system to transmit hydraulic pressure. It has higher viscosity, poorer fluidity, a distinct odor, and some corrosive properties. Below are the primary uses of power steering fluid and brake fluid: 1. Brake fluid. Apart from the braking system, it can, under certain conditions, substitute for clutch fluid. 2. Power steering fluid. In addition to its use in power steering systems, it can, under specific conditions, replace automatic transmission fluid (ATF).
I've been driving for over a decade, and people often ask if power steering fluid and brake fluid are the same thing. In reality, they're completely different. Power steering fluid is used for the steering assist system, like lubricating the steering pump oil, usually the ATF automatic transmission fluid type; brake fluid is the lifeline of the braking system, a high-pressure hydraulic fluid with a high boiling point. If mixed up or used incorrectly, it can corrode the lines, leading to brake failure or even accidents due to inability to stop. From experience, I know that power steering fluid needs to be checked and replaced every 20,000-30,000 kilometers or every two years to prevent stiff steering; brake fluid should be replaced every two years because absorbed moisture lowers its boiling point, making it dangerous during hard braking at high temperatures. Remember, don't try to save money by using one fluid for both. A friend of mine made this mistake last time and almost rear-ended someone. Safety is no small matter—stick to the maintenance manual.
