Let’s discuss disc brake fluids and a few of their specifics. Aside from the most popular DOT 3 & 4 variants, a few more options are available.
When discussing high-performance automobiles, we also consider brakes like mechanically linked, hydraulic, and air brakes. The hydraulic disc brake systems used on Indian motorcycles are the sole subject of this article. Motorcycles frequently use disc brakes. Brake maintenance is ignored because spare parts are expensive, maintenance knowledge is lacking, and so on.
Let’s consider the supplies we obtain and use. The caliper and master cylinders we purchase from the manufacturer are made of aluminum, and the company also advises using DOT 3 or 4 fluid for activation.
Types of Disc Brake Fluid On The Market
The three most common types of brake fluid available on the market are DOT3, DOT4, and DOT5.
1. DOT 3
Glycol-based DOT3 brake fluid is the most popular type on the market. This brake fluid has always been available on the market. Despite being outdated, it is still widely used due to its cost-to-performance ratio. The boiling point of freshly manufactured DOT3 brake oil is around 205 degrees Celsius. On the other hand, old can only sustain temperatures of 140 degrees Celsius if it has degenerated. Lack of brake oil changes can cause the oil to overheat. That will reduce the vehicle’s ability to brake.
2. DOT 4
Moving on to a marginally more expensive substitute, DOT4. This brake fluid is also glycol-based, but it is made differently. DOT4 brake oil can endure temperatures of up to 230 degrees Celsius due to its unique composition. Additionally, we can reduce or eliminate moisture accumulated inside the system simply by adding a few chemicals. Additionally, these work better with vehicles that have TC and ABS.
3. DOT 5
DOT5 is one of the most expensive brake fluids. The silicone base of DOT5 brake oil is its finest feature. DOT5 brake fluid can easily withstand temperatures of about 260 degrees Celsius due to its chemical makeup. Another benefit is that this fluid does not absorb water, unlike braking fluids based on glycol. But there are several issues with DOT5 oil. Additionally, brakes make foam (lather) easier to form. And unlike air, these foam bubbles are much more difficult to bleed.
4. DOT 5.1
The DOT 5.1 brake fluid is the one on the list that can withstand the maximum temperature. Therefore, borate ester and glycol ether are combined in DOT 5.1 brake fluid. Its complex composition can withstand temperatures up to 260 degrees Celsius. DOT 5.1 brake oil has several characteristics in common with DOT 3 and DOT 4. The most notable one is that it is hygroscopic as well. Thus, it can absorb moisture.