Many car owners routinely change the engine oil, check the coolant, and replace brake pads. However, there is one important fluid that is often forgotten: brake fluid.
As long as the brake pedal still feels normal and the brake fluid level is still between the minimum and maximum limits, some people assume the brake fluid is still safe to use. In fact, the condition of the brake fluid does not only depend on the amount of fluid in the reservoir.
Brake fluid has an important task in the braking system. When the driver presses the brake pedal, this fluid transmits hydraulic pressure to the braking components at the wheels. Brake fluid also helps lubricate the hydraulic components while providing protection against corrosion.
The problem is, brake fluid can’t maintain its quality forever. Over time and with use, the fluid’s quality can deteriorate. If you never replace it, the performance of the braking system could be compromised.
Then, What happens if the brake fluid is never changed?
Brake Fluid Absorbs Moisture Over Time
Most commonly used brake fluids, including DOT 3, have the following properties: hygroscopic. This means the liquid can slowly absorb moisture from the air.
Although the braking system appears sealed, moisture can still get in little by little during use. The longer you use brake fluid, the greater the likelihood that its water content will increase.
That water content becomes a problem because it can lower the boiling point of brake fluid.
When you brake repeatedly, especially when going downhill, carrying heavy loads, or facing stop-and-go traffic, the braking system generates high heat. Brake fluid must be able to handle these temperatures without boiling.
For example, the DOT 3 standard requires a minimum dry boiling point of approximately 205°C and the minimum wet boiling point is around 140°C. The difference shows how great the influence of moisture is on the brake fluid's ability to withstand high temperatures.
When the fluid reaches its boiling point, vapor bubbles can appear in the hydraulic system. Unlike fluids, vapor is easier to compress. This condition can cause braking pressure to become inconsistent and the pedal to feel spongy.
That’s why simply checking to see if the brake fluid is at the full mark isn’t enough to determine its condition.
These Are the Risks If Brake Fluid Is Never Replaced
The longer you leave brake fluid without replacement, the greater the likelihood its quality will decline.
One of the symptoms that may appear is The brake pedal feels softer or needs to be pressed deeper. That condition does not always originate from brake fluid, as issues with the brake pads, leaks, air in the system, the master cylinder, and other components can also cause similar symptoms. Therefore, immediately conduct an inspection when the pedal's behavior starts to change.
The next risk arises when the brakes operate at high temperatures. Brake fluid that has absorbed a lot of moisture has a lower boiling point. As the system temperature increases, the fluid more easily forms vapor bubbles and reduces the consistency of braking pressure. Bosch explains that the more water contained in the brake fluid, the lower its boiling point and the greater the risk of vapor bubble formation.
Moisture can also increase the risk of corrosion on the internal parts of the braking system. Quality brake fluid contains additives to help protect hydraulic components from corrosion while providing lubrication.
So, the problem isn't just that the brake fluid has changed color.
Brake fluid that has been in use for too long may deteriorate in quality—a decline that isn’t always visible to the naked eye. Therefore, don’t wait until you notice a problem with the pedal before considering a brake fluid change.
When Should You Change the Brake Fluid?
There is no one-size-fits-all interval for every car. Vehicle manufacturer recommendations remain the primary reference because the brake system design and brake fluid specifications can vary from vehicle to vehicle.
As a general guideline, Toyota Indonesia states that the brake fluid replacement interval is approximately 20,000–40,000 km or a maximum of about two years, depending on the vehicle's usage conditions. Cars that frequently face traffic jams, mountain roads, heavy loads, or high braking temperatures may require attention sooner.
In addition to the intervals, you can also look for certain signs.
Check the color and condition of the fluid in the reservoir. Brake fluid that has turned very dark or cloudy requires further inspection. Also pay attention to any changes in pedal feel, especially if the pedal starts to feel deeper or spongy.
However, don’t just add brake fluid every time the level drops.
A low brake fluid level can be related to worn brake pads or even a leak in the system. If the level continues to drop, find the cause first.
When changing the brake fluid, use DOT specifications that comply with the vehicle manufacturer's recommendations. Don't choose brake fluid based solely on the assumption that a higher DOT rating is always better.
The braking system is designed with specific brake fluid characteristics. Therefore, always check the manual or vehicle manufacturer's recommendations before choosing a product.
Maintain the braking system with AutoGard MAXI-GO Brake Fluid DOT 3
If your vehicle recommends using DOT 3, choose quality brake fluid to help keep the braking system working optimally.
AutoGard MAXI-GO Brake Fluid DOT 3 available as a choice for vehicle braking system maintenance that requires DOT 3 specifications.
Brake fluid plays a direct role in transmitting pressure from the pedal to the braking system. Therefore, do not wait too long for the fluid to remain in the system before replacing it.
Make replacements according to the vehicle recommendations and use AutoGard MAXI-GO Brake Fluid DOT 3 for vehicles that genuinely require DOT 3 specifications.
Do not only pay attention to the pads and discs when maintaining the brake system. Pay attention to the fluid working inside the hydraulic system as well.
Brake fluid still being full doesn't mean its quality is still optimal.
If the usage age has reached the replacement interval, inspect and replace the brake fluid before its quality deteriorates further.
With AutoGard MAXI-GO Brake Fluid DOT 3, you can complete the brake system maintenance so that the hydraulic pressure continues to work as it should.
Don't wait until the brake pedal changes. Check your vehicle's brake fluid replacement schedule and use AutoGard MAXI-GO Brake Fluid DOT 3 according to your vehicle's specifications.
Because when it comes to the braking system, proper maintenance is not just about driving comfort, but also about preserving the function of one of the most important safety systems in a vehicle.
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