Is DOT4 Brake Fluid Universal?

[MacKira]

DOT4 brake fluid is not universal. Different types of brake fluids have different boiling points and freezing points, so they cannot be used interchangeably. Brake fluid is a crucial component of a car's braking system. Below is a detailed introduction to automotive brakes: Braking: Braking, also known as stopping, refers to the action of halting or reducing the speed of moving locomotives, vehicles, and other transportation tools or machinery. The braking device is a mechanical braking system that slows down the vehicle, also known as a decelerator. Braking System: The braking system consists of a control system, hydraulic system, and power assist system. The control system includes the pedal, handbrake, etc. The hydraulic system is composed of hydraulic fluid, brake pump, and hydraulic lines. The power assist system is the vacuum booster pump. The electronic control system consists of the ABS pump, ABS sensors, and ABS computer. The execution system includes the brake caliper, brake pads, and brake disc.

[VanTheo]

DOT4 brake fluid is quite versatile, but it's not an absolute universal solution. With over 20 years of driving experience and numerous brake fluid changes, I can confirm that DOT4 is compatible with DOT3. So if your vehicle's manual recommends either DOT3 or DOT4, using DOT4 directly is perfectly fine – it even has a higher boiling point for more stable braking. However, DOT5 is silicone-based and must never be mixed, as it can cause bubbling and brake system failure. I've personally witnessed a friend cutting corners with the wrong type, resulting in brake failure on the highway that nearly caused an accident. Most modern vehicles are suited for DOT4, especially for long-distance travel or aggressive driving, where its high boiling point minimizes vapor lock. I recommend checking it every two years – it absorbs moisture quickly, degrading performance. Safety comes first; never cut corners.

[EstherDella]

Having worked in an auto repair shop for many years, I've handled countless brake cases. DOT4 is glycol-based, with a formulation similar to DOT3, so it has good compatibility and can be used as a substitute for DOT3. However, DOT5 and DOT5.1 are silicone-based, and mixing them can cause chemical reactions, leading to brake fluid deterioration, increased vapor lock, or even system damage. Not all vehicles are compatible—high-performance cars may specifically require DOT4. Boiling point is crucial; DOT4 has a higher dry boiling point, making it suitable for high-temperature environments. In practice, I advise car owners to check the manual first and avoid changing fluids blindly. Regular maintenance can prevent major issues.

[WalterAnn]

When I first started learning to drive, I was completely confused about brake fluid. After researching, I found that DOT4 is generally universal and compatible with DOT3 vehicles, but it cannot be used in DOT5 vehicles due to different types. To be safe, I always have professionals handle it—they select the fluid based on the vehicle model. Over time, brake fluid absorbs moisture, which lowers its boiling point and affects braking distance, so regular replacement is crucial. Simply put, consulting the manual is the most reliable approach.