Last Updated on September 16, 2022
When did Harley stop using DOT 5 brake fluid? What were the reactions? What was the reason for the change? We answer those questions and more in this article. We also address the problems of using DOT 5 with Dot 4 seals and hard bleeds. Also, we answer the question, “What should I use?”
DOT 5 brake fluid
When did Harley stop using DOT 5 brake fluid? Well, that depends on the model and year of the bike. If it has ABS, it is best to use DOT 4 brake fluid. Harley uses silicone based brake fluid, which is incompatible with DOT 5. However, DOT 5 brake fluid is not interchangeable with other motorcycle braking fluids. So, you may have a problem using the wrong one.
DOT 5 brake fluid is a hydrophobic liquid, which means that it does not mix with water. This means that it will not cause bubbles on painted surfaces, as happens with glycol-based fluids. Instead, DOT 5 brake fluid has a higher boiling point than glycol-based ones. But, in theory, the difference between the two types of fluid is just the size. DOT 5 brake fluid also prevents moisture contamination.
DOT 5 is silicone-based, which is the same as DOT 4 but slightly spongier. While Dot 4 is two times less compressible, it is still more pliable and provides better braking feel. However, silicone-based fluids contain more silicone, which softens derometers in seals and may leak. When did Harley stop using dot 5 brake fluid? Please share your thoughts in the comments below.
While dot 3 and dot 4 are within acceptable parameters for Harley motorcycles, dot 5.1 is silicon-based and compatible with DOT 3 and dot 4. In the U.S., dot 5.1 is compatible with dot 3-4, but it will not significantly increase stopping power. If you want to use dot 5.1 for your Harley, you should purchase DOT 5.1. The other options are silicone-based and glycol-based.
Reactions with Dot 4 seals
DOT 5 and DOT 4 are two different fluids, but both are extremely important to keep your motorcycle in good condition. DOT 5 is the preferred fluid for motorcycles. The reason why is that DOT 4 is the most effective corrosion and moisture inhibitor. However, contact with DOT 4 can cause serious health problems, including death. Failure to use protective gear when working with DOT 4 fluid can lead to serious health consequences.
When compared to the Dot 4, DOT 5 is 2x more spongy. It is this increased compression and softer derometer that results in improved braking feel. The disadvantage of DOT 5 is that it is incompatible with ABS systems. Choosing the wrong type of brake fluid can damage your motorcycle’s braking system. If you’re wondering which one to use, here’s what you should know.
Dot 3 and DOT 4 are acceptable replacements for Harley motorcycles. The Dot 5.1 replacement is compatible with DOT 3 and DOT 4 seals, and is silicon-based. While neither dot 5.1 nor dot 5.1 are better than DOT 3 or DOT 4 seals, they are still a viable option for most motorcycles. Although neither of these are perfect for Harley motorcycles, they are still far better than using DOT 4 on your bike.
Hard to bleed
If your Harley is bouncy when you press the brake pedal, you might have air trapped inside. Bleeding the brake valve may help fix the problem. To bleed the brake valve, remove the rubber cap from the rear brake caliper and insert the plastic tubing over the valve’s tip into a jar. To access the reservoir, unscrew the four-millimeter-diameter cover and insert a bleeder tube. Insert the other end of the plastic tubing into a jar. Remove the reservoir cover and replace the old brake fluid with new DOT 4 for a clean, safe ride.
Hard to bleed with DOT 5
While DOT 5 is similar to other traction fluids, it is harder to bleed with than DOT 4. This viscosity is due to the constant pumping of a pedal, which stirs up the fluid and traps tiny air bubbles. The viscosity of DOT 5 makes it difficult for trapped air to escape, but power bleeders are available that can remove air from a traction fluid.
In order to bleed with DOT 5, you need to remove air from your braking system. The air can take anywhere from three to four days. DOT 5 fluid takes up to three days to bleed fully, so bleeding slowly using a pressure bleeder is your best bet. In addition to removing air, DOT 5 can also detect tiny leaks, so you need to bleed slowly. To properly remove air, squeeze the lever a dozen times while pressing the bleeder into the brake system.
A DOT 5 fluid will not harm your paint, unlike DOT 3 and DOT 4. A DOT 5 brake system is more durable than those filled with other formulas. They are rust-resistant and will last longer. Unlike other types of braking fluid, DOT 5 will not degrade when exposed to cold temperatures. However, it has a spongy texture. While DOT 5 brake fluid will not damage paint, it will corrode internal components. It is recommended that you change your brake fluid and flush it once a year.
While DOT 5 is a viable option for some vehicles without ABS, it will require patience and care during the bleeding process. The best time to switch to DOT 5 is when you rebuild your brake system. However, even if you switch to DOT 5, you should keep in mind that it still needs to be changed regularly. It is important to remember that moisture still gets into your braking system, and it hides in the lower bends of your brake lines, the bottom of the calipers, and in the wheel cylinders.
About The Author
Alison Sowle is the typical tv guru. With a social media evangelist background, she knows how to get her message out there. However, she's also an introvert at heart and loves nothing more than writing for hours on end. She's a passionate creator who takes great joy in learning about new cultures - especially when it comes to beer!