Thread Sealant For Brake Fluid: What You Need To Know

Permatex 59235 High Temperature Thread Sealant, 50 ml Tube


If you’re a car owner or a mechanic, you know how important it is to have a reliable braking system. One of the essential components of your vehicle’s braking system is the brake fluid. But did you know that the thread sealant used to seal the brake fluid fittings is just as crucial? In this article, we’ll discuss everything you need to know about thread sealant for brake fluid.

What is Thread Sealant?

Thread sealant is a type of adhesive that is used to seal the threads of fittings and connections. In the case of brake fluid fittings, it is essential to use a thread sealant that can withstand the high pressures and temperatures that the brake fluid generates. The sealant must also be resistant to brake fluid, which is a corrosive substance.

The Importance of Using Thread Sealant for Brake Fluid

Using the right thread sealant for brake fluid is crucial to ensure that your brake system is safe and reliable. If the fittings are not adequately sealed, brake fluid can leak out, leading to a loss of pressure and reduced braking performance. This can be dangerous, especially in emergency situations. Using the wrong type of sealant or not using any sealant at all can also cause corrosion and damage to the fittings.

Types of Thread Sealant for Brake Fluid

There are two main types of thread sealant for brake fluid: Teflon tape and anaerobic sealant. Teflon tape is a thin, white tape that is wrapped around the threads of the fitting. Anaerobic sealant is a liquid that is applied to the threads and hardens when it comes into contact with metal. Both types of sealant are effective, but anaerobic sealant is generally considered to be more reliable and long-lasting.

How to Apply Thread Sealant for Brake Fluid

Before applying thread sealant, it is essential to clean the threads of the fitting thoroughly. Any dirt or debris can compromise the effectiveness of the sealant. Apply the sealant to the threads in a thin, even layer. Do not apply too much sealant, as this can cause excess sealant to enter the brake system and cause clogs.

Common Mistakes When Using Thread Sealant for Brake Fluid

One of the most common mistakes when using thread sealant for brake fluid is using the wrong type of sealant. Always check the manufacturer’s recommendations for the correct type of sealant to use. Another mistake is applying too much sealant, which can cause clogs in the brake system. It is also essential to ensure that the threads are clean and free of debris before applying the sealant.

When to Replace Thread Sealant for Brake Fluid

Thread sealant for brake fluid does not last forever. Over time, it can break down and lose its effectiveness, especially if it is exposed to high temperatures and pressures. It is recommended to replace the sealant every time the fitting is disconnected or serviced.


Thread sealant for brake fluid is a critical component of your vehicle’s braking system. Using the right type of sealant and applying it correctly can ensure that your brakes are safe and reliable. Make sure to follow the manufacturer’s recommendations and replace the sealant regularly to avoid any potential issues.