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Sweatband for brake fluid reservoir

For some, the sweatband around the brake fluid reservoiron a motorcycle is just a great gadget with which they can show their attachment to a brand or a racing team. For others it is a useful addition. But what exactly is behind MotoGP's colourful sleeves, which you can get from TecBike in various designs and colours?

More protection for expansion tank and co. from MotoGP

The sweatband is a flexible and stretchable cuff. It consists of a supple and absorbent fabric. In spite of all care, one or the other droplet of brake fluid can "cheat" its way out of the expansion tank. It is highly corrosive. Even the smallest amounts are enough to leave damage on the windscreen of your motorcycle or on your helmet visor. This can reduce your visibility on the race track or in traffic, or ruin the bodywork of your bike.

How does fluid leakage occur? This can be caused by the vibrations of the machine or a strong inclination of the bike in corners.

This is less known

If the level of brake fluid in the reservoir decreases, the risk of fluid being absorbed by the environment also increases. It has a negative effect on braking performance and the lever travel is longer.

A few more facts about the sweatband

In forums, social networks or on blogs, it is very often the opinion that sweatbands would have the task of protecting the contents in a brake fluid reservoir from solar radiation. This in turn should prevent the fluid from heating up too much, which would compromise its physical properties.

This line of reasoning leaves out some important parameters. Brake fluids used by the top teams in Superbike and MotoGP have an appropriate working temperature and a very high boiling point. Let's take a closer look at the brake fluid.

A little basic knowledge about brake fluid

Goodbrakes are essential for safe motorcycleriding. Most bikers think primarily of their brake pads. But people tend to forget that the brake fluid, as part of the hydraulic brake system, also needs regular attention and needs to be changed.

The fluid is usually based on glycol and is hygroscopic. This means that even in a closed system, it will absorb water over time. Since water is known to evaporate at more than 100 degrees Celsius, the boiling point of the brake fluid decreases with increasing water content.

When you pull the brake lever, the hydraulic brake system presses the brake pads against the brake discs. The friction generates heat. It continues into the brake caliper. The best example of this is emergency braking or a downhill run.

As the water content in the brake fluid increases, vapour bubbles can form in the high heat. If the hydraulic system now generates pressure, it is no longer passed on optimally. The braking pressure point literally collapses. In practice, this means that the hand lever or the brake pedal give way and there is no braking effect. Before you can feel the pressure point again, you have to pump several times. Therefore, it is essential to change brake fluid according to the manufacturer's instructions.

DOT classes and their boiling points

Glycol-based automotive brake fluids are divided into different quality classes according to the "American Department of Transportation", or DOT for short.

DOT 3: The wet boiling point is approx. 140° C.

DOT 4: Here the wet boiling point is approx. 160° C.

DOT 5.1: This brake fluid has a wet boiling point of approx. 180° C.

Racing Formula: Brake fluids for use on the race track have an even higher wet boiling point. The exact values can be found in the respective product.

In addition to the glycol-based hydraulic fluids already mentioned, there are also brake fluids that are classified as DOT 5. They have a silicone base and are used in many Buell or Harley-Davidson models. While glycol-based brake fluids can be mixed with each other without any problems, the brake system must be flushed completely and thoroughly if you want to change to DOT 5 brake fluid. If the brake fluid is mixed with other fluids, there is a risk of flocculation and clogging of the entire system.

High quality sweatbands for your bike

In the TecBike range you will find a wide selection of accessories and add-on parts for motorcycles. Do you have any questions about our products? Contact us, we will be happy to advise you!

Sweatband for brake fluid reservoir For some, the sweatband around the brake fluid reservoir on a motorcycle is just a great gadget with which they can show their attachment to a brand or a... read more »
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Sweatband for brake fluid reservoir

For some, the sweatband around the brake fluid reservoiron a motorcycle is just a great gadget with which they can show their attachment to a brand or a racing team. For others it is a useful addition. But what exactly is behind MotoGP's colourful sleeves, which you can get from TecBike in various designs and colours?

More protection for expansion tank and co. from MotoGP

The sweatband is a flexible and stretchable cuff. It consists of a supple and absorbent fabric. In spite of all care, one or the other droplet of brake fluid can "cheat" its way out of the expansion tank. It is highly corrosive. Even the smallest amounts are enough to leave damage on the windscreen of your motorcycle or on your helmet visor. This can reduce your visibility on the race track or in traffic, or ruin the bodywork of your bike.

How does fluid leakage occur? This can be caused by the vibrations of the machine or a strong inclination of the bike in corners.

This is less known

If the level of brake fluid in the reservoir decreases, the risk of fluid being absorbed by the environment also increases. It has a negative effect on braking performance and the lever travel is longer.

A few more facts about the sweatband

In forums, social networks or on blogs, it is very often the opinion that sweatbands would have the task of protecting the contents in a brake fluid reservoir from solar radiation. This in turn should prevent the fluid from heating up too much, which would compromise its physical properties.

This line of reasoning leaves out some important parameters. Brake fluids used by the top teams in Superbike and MotoGP have an appropriate working temperature and a very high boiling point. Let's take a closer look at the brake fluid.

A little basic knowledge about brake fluid

Goodbrakes are essential for safe motorcycleriding. Most bikers think primarily of their brake pads. But people tend to forget that the brake fluid, as part of the hydraulic brake system, also needs regular attention and needs to be changed.

The fluid is usually based on glycol and is hygroscopic. This means that even in a closed system, it will absorb water over time. Since water is known to evaporate at more than 100 degrees Celsius, the boiling point of the brake fluid decreases with increasing water content.

When you pull the brake lever, the hydraulic brake system presses the brake pads against the brake discs. The friction generates heat. It continues into the brake caliper. The best example of this is emergency braking or a downhill run.

As the water content in the brake fluid increases, vapour bubbles can form in the high heat. If the hydraulic system now generates pressure, it is no longer passed on optimally. The braking pressure point literally collapses. In practice, this means that the hand lever or the brake pedal give way and there is no braking effect. Before you can feel the pressure point again, you have to pump several times. Therefore, it is essential to change brake fluid according to the manufacturer's instructions.

DOT classes and their boiling points

Glycol-based automotive brake fluids are divided into different quality classes according to the "American Department of Transportation", or DOT for short.

DOT 3: The wet boiling point is approx. 140° C.

DOT 4: Here the wet boiling point is approx. 160° C.

DOT 5.1: This brake fluid has a wet boiling point of approx. 180° C.

Racing Formula: Brake fluids for use on the race track have an even higher wet boiling point. The exact values can be found in the respective product.

In addition to the glycol-based hydraulic fluids already mentioned, there are also brake fluids that are classified as DOT 5. They have a silicone base and are used in many Buell or Harley-Davidson models. While glycol-based brake fluids can be mixed with each other without any problems, the brake system must be flushed completely and thoroughly if you want to change to DOT 5 brake fluid. If the brake fluid is mixed with other fluids, there is a risk of flocculation and clogging of the entire system.

High quality sweatbands for your bike

In the TecBike range you will find a wide selection of accessories and add-on parts for motorcycles. Do you have any questions about our products? Contact us, we will be happy to advise you!

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