When it comes to driving safely, paying attention to every little thing matters a lot. Brake fluid is vital for that. As it helps us stop our cars when we press the brake pedal. But not all brake fluids are alike. In this article, we’ll look into the various types of brake fluids. This includes DOT 3, DOT 4, DOT 5, and DOT 5.1.
Types of brake fluids and their Specifications
DOT 3: the reliable standard
DOT 3 brake fluid is widely popular. It’s a glycol-based fluid known for having a higher boiling point compared to water. This reduces the likelihood of vapor bubbles forming in the brake system. Nevertheless, as time passes, its boiling point may decrease due to absorbing moisture. Hence, potentially affecting its performance in extreme conditions.
This type of brake fluid is commonly used in domestic cars and trucks. The Society of Automotive Engineers (SAE) provides further specs. Specifically, that the DOT 3 brake fluid can absorb about 2 percent of its volume in water annually. Over time, excessive moisture can lead to corrosion within the brake system. Consequently, it causes issues like vapor lock or a spongy pedal.
DOT 4 – balancing performance and cost
Formulated for universal vehicle use, DOT 4 surpasses DOT 3. The reason is its higher boiling point and slower moisture absorption. However, DOT 4 and DOT 3 can be used interchangeably. But, it’s advisable to refrain from adding DOT 3 fluid to a system already using DOT 4. Preferred for its high-performance applications, DOT 4 is the recommended fluid type .
DOT 5 – the silicone-based alternative
DOT 5 is silicone-based and doesn’t absorb moisture. Thus, making it a preference among street rodders for its non-corrosive properties towards paint and other brake components. This quality makes it ideal for preserving classic cars. However, silicone-based fluids have drawbacks. Firstly, they expand more upon compression, resulting in a potentially spongy pedal feel. Furthermore, DOT 5 fluids cannot be mixed with any other brake fluid types. To differentiate it from DOT 3, DOT 4, and 5.1 fluids, DOT 5 typically has a violet tint.
DOT 5.1: improving the formula
DOT 5.1 brake fluid, an advancement from DOT 4, shares a glycol-based composition. It boasts an even higher boiling point, delivering better performance in extreme conditions. Unlike DOT 3 and DOT 4, it’s less prone to moisture absorption. Hence, maintaining its performance characteristics for an extended period.
DOT 5.1, a non-silicone-based polyglycol, possesses a boiling point exceeding 500 degrees. Unlike DOT 5, it allows mixing with DOT 3 or DOT 4 fluids. DOT 5.1 is highly recommended for severe-duty and high-performance applications, typically having the highest-rated boiling point.
How Often Should You Change the Brake Fluid in a Toyota?
Typically, Toyota suggests changing brake fluid every two years or after covering 20,000 miles. Yet, various factors can influence this schedule. Different drivers have varying brake usage, and some are tougher on brakes than others. The frequency might also relate to your car’s age, mileage, and driving conditions. Additionally, climate plays a factor too.
Skilled technicians ensure the good condition of your brake fluid by checking it regularly using a brake fluid tester. This collects a sample and tests its boiling point to determine its quality.
While DIY brake fluid testers are available, they’re often unreliable. You could use one as a general reference. However, it’s recommended to have a Toyota technician validate the results.
How to remove the brake fluid reservoir from the master cylinder?
Step 1: Raise the Hood
The master cylinder is situated in the car’s engine compartment. Therefore, you’ll need to raise the hood to access it.
Step 2: Locate the Main Cylinder
The positioning of the master cylinder is usually near the driver’s seat, adjacent to the firewall. Additionally, it typically comprises metal or plastic materials. One can identify it by observing four hoses and the connected brake line.
Step 3: Protect the Cylinder with a Vise
To secure the master cylinder safely, use a vise to hold it firmly in place. This will stabilize the cylinder, ensuring safety during the procedure. Keep in mind that without clamping it with a vise, the entire process might become more challenging to remove.
Step 4: Slide the Screwdriver/Pry Bar
Ensure the vise is secure. Then, insert a flathead screwdriver or a pry bar between the brake fluid reservoir and the cylinder.
Step 5: Nudge the Reservoir Apart
Slide the screwdriver or pry bar between the cylinder and reservoir. This will disconnect the reservoir from the cylinder once you push it. So, go ahead and separate the reservoir from the cylinder. After that, take out the rubber that holds the two parts together. That’s it! Your task is finished!
Selecting the correct brake fluid is crucial for a vehicle’s braking system efficiency and safety. Knowing the differences between brake fluid types is essential for informed decisions. Regular checks, timely changes, and following manufacturer guidelines ensure a reliable braking system.
Toyota Recommended DOT 3 brake fluid to maintain standard and performance of your vehicle.
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