Dot 3 vs Dot 4 Brake Fluid: What’s the Difference?ĭot 3 and Dot 4 brake fluids are both glycol-based fluids, but they differ in their composition and performance characteristics.ĭot 3 fluid is typically composed of a blend of ethylene glycol and diethylene glycol, while Dot 4 fluid is usually made with a blend of borate esters and polyglycols.ĭot 3 fluid has a lower boiling point than Dot 4 fluid, making it less ideal for use in high-performance vehicles or in conditions where the brakes will be used frequently.ĭot 4 fluid, on the other hand, offers a higher level of performance and is better suited for use in race cars or other vehicles that see heavy braking action. Be sure to consult with a qualified mechanic to ensure that you are using the correct DOT-rated fluid for your vehicle. On the other hand, lower-grade DOT 3 and 4 fluids are typically considered best suited for everyday use in most passenger vehicles.īrake fluid is an important part of your vehicle’s braking system and it is important to choose the right type of fluid for your needs. Some brake fluids may receive a higher DOT rating than others depending on their performance under certain conditions.įor example, some higher-grade DOT 5 silicone-based fluids are known for having very high boiling points, making them ideal for use in vehicles that will be driven in extreme heat or other harsh conditions. This rating system takes into account a number of factors, including the boiling point and composition of the fluid, to determine which class it falls into. The ‘dot’ in brake fluid refers to the Department of Transportation (DOT) rating system that is used to classify different types of brake fluids based on their performance characteristics and safety properties. If necessary, they can also flush out your entire system and refill it with fresh, clean brake fluid. They will be able to check the level of fluid in your system and test it for contamination. If you suspect that your brake fluid may be getting low or dirty, it is important to have it checked by a qualified mechanic as soon as possible. This can cause your vehicle to pull to one side when braking or may make it difficult to stop in a straight line. In addition, an insufficient amount of clean brake fluid means that other parts of your braking system may be damaged as well.įor example, if there is not enough fluid in the system to properly lubricate the brake calipers, they may start to seize up and fail to apply pressure evenly to the brake pads. This means that you will need to apply more force with your foot just to make sure that sufficient pressure can be applied at all times, which can quickly lead to premature wear on your brake pads and rotors. If your brake fluid starts to get low or is contaminated with other materials, there may not be enough liquid in the system to create the necessary pressure needed to slow down or stop your vehicle. The most important function of your brake fluid is to carry force from the brake pedal to the brakes themselves. Silicone-based brake fluid is generally colorless and odorless, but it can sometimes have a slightly sweet flavor if you taste it. This particular kind of liquid is designed with specific properties that make it ideal for interacting with other parts of your vehicle’s braking system while providing excellent performance under most conditions. Most modern cars use hydraulic braking systems which use a special type of brake fluid known as silicone-based brake fluid. This makes it vital to keep your brake fluid clean and in good condition so that you can rely on its performance as you drive. Without this important component, you would have no means of slowing down or coming to a full stop when driving. It is used to transmit force from your brake pedal to the brake pads that press against the brake rotors, stopping your vehicle. Any price and availability information displayed on at the time of purchase will apply to the purchase of this product.īrake fluid serves an essential function in the operation of your car. Product prices and availability are accurate as of the date/time indicated and are subject to change. Prices pulled from the Amazon Product Advertising API on:
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