How To Check Brake Fluid In A Car? [ In 4 Steps ]

The brakes on a car are one of the most important safety features and should be taken care of to ensure proper maintenance. One way to take care of your brakes is to check the brake fluid regularly, which often helps prevent costly repairs. Unfortunately, many drivers don’t check their brake fluid until there is a leak or other issue with the brakes.

Thankfully, checking brake fluid is easy and can be part of your regular car care routine. All you need to do is pop open the hood, look for a transparent reservoir or bottle near the engine where the brake fluid collects, and then check its level. Dig into learn a step by step how to check the brake fluid in a car.

Here is How to Check Brake Fluid in A Car

1. Ensure your car is parked flat to ensure accurate readings.

2. Locate the brake fluid reservoir. This should be marked with a symbol and will likely have a “Brake Fluid” cap written on it. It is usually located near the engine compartment’s firewall but may vary depending on your vehicle’s make and model.

3. Remove the cap and inspect the brake fluid. It should be a transparent, light-amber color with no visible signs of debris or discoloration. If it is dark brown or black, this could indicate contamination from moisture or dirt, and the fluid should be replaced immediately.

4. Check the level of brake fluid. If it is too low, add brake fluid to the reservoir until it reaches the “Max” line.

Once you have completed these steps, you should be able to determine whether or not your brakes need maintenance. You can return to driving with peace of mind if everything looks normal. However, if you notice any irregularities, it may be time to visit a mechanic for further inspection.

When to Schedule A Brake Fluid Flush?

Since brakes are one of the most vital systems on a car, it’s important to keep up with brake fluid flushes. Generally speaking, automobile manufacturers suggest a brake fluid flush should be performed every 24 months or 30,000 miles. That being said, this standard may differ for different makes and models of vehicles.

As a result, it’s always best to consult your car’s owner’s manual to understand when the service interval is suggested for your vehicle.

Despite many vehicle makers providing suggestions on scheduling brake fluid flushes, they really only serve as general guidelines. The only definitive way to know if your car needs a brake fluid flush is to use an appropriate testing kit or have it professionally inspected by a qualified mechanic.

Keeping up with these scheduled services will ensure that you get the best performance out of your vehicle and that your brakes will continue working effectively now and in the future.

Why Do I Need to Check Brake Fluid?

Checking the brake fluid in a car is essential for ensuring safe and reliable brake performance. Brake fluid is a hydraulic fluid that transfers power from the master cylinder to the brakes when you press down on the pedal.

As it travels through the system, brake fluid can become contaminated with air or water, reducing its ability to lubricate, corrode metal parts, and create leaks in the system. This could lead to costly repairs or dangerous braking conditions if left unchecked.

Regularly checking the condition and level of your brake fluid ensures that your vehicle’s brakes are in good working order. Additionally, a brake fluid check during regular maintenance services can help identify potential issues before they become more serious problems. This is especially important if you drive an older car, as the brake system can be more susceptible to wear.

What Happened If You Drive Around with Low Brake Fluid?

Driving with low brake fluid can cause serious problems and even dangerous accidents. Without the right level of brake fluid, your brakes will not be able to respond quickly and effectively when you need to stop.

The most common symptom of low brake fluid is a spongy feeling when you press down on the brake pedal. This means the brakes are not responding as quickly as they should, making it difficult to stop in an emergency.

In addition to being unable to stop quickly, low brake fluid can lead to air bubbles in the system. Air bubbles will cause your brakes to fail, leaving you without any way of stopping your vehicle. As such, you must check your brake fluid regularly and top it off when necessary.

How to Maintain Your Brake Fluid?

Maintaining your brake fluid is important in keeping your car’s brakes in good working order. The best way to ensure your brake fluid is at the right level and free of contaminants is to have a professional mechanic perform a thorough inspection. This will involve draining and replacing the existing fluid and checking for any air or water contamination signs.

Maintaining a clean environment around the brake system’s also important to take extra care in preventing brake fluid from being contaminated. Brake fluid is hygroscopic, which means it absorbs moisture from the atmosphere.

As such, keeping your brakes away from water sources, such as rain and snow, is important. Additionally, always keep the cap on your brake fluid reservoir and only fill it to the maximum level marked on the side.

Frequently Asked Questions [FAQs]

1. What Happens If The Brake Fluid Is Low?

If the brake fluid in a car is too low, it can cause serious safety issues. If the brake fluid level is below the minimum line, then there isn’t enough fluid to activate the brakes properly.

This could result in longer stopping distances and reduced braking performance, leading to longer reaction times for drivers and an increased risk of accidents. In extreme cases, if the brake fluid is completely empty, the brakes may not work.

2. How Often Should I Check My Brake Fluid?

You should check your brake fluid at least once a month or more frequently if you drive frequently in wet or cold conditions. Additionally, most vehicle manufacturers recommend having a professional mechanic inspect your brakes and flush the brake fluid every two years or 24,000 miles.

3. Can I Drive Without Brake Fluid?

No, it is not safe to drive a vehicle without brake fluid. Brake fluid is essential for the stopping power of your brakes and should be checked regularly. If there isn’t enough brake fluid in the system, your brakes won’t work properly, and you could lose control of the car when trying to stop. Driving without brake fluid can also cause other damage to the braking system and make it more prone to failure.

4. Can We Use Water Instead Of Brake Oil?

No, water should not be used instead of brake fluid in a car. Brake fluid is specifically designed to withstand the high temperatures and pressures the braking system creates. In contrast, water will boil off too quickly or corrode the system because it does not have the same lubrication properties.

Additionally, brake fluids contain additives that help prevent corrosion and absorb moisture from the air, further preventing damage to the braking system.

5. What Color Is Brake Fluid?

Brake fluid typically has a light yellow color, which may darken as it ages. If you observe leakage from the wheel wells, it may signal a potential issue.


Checking your brake fluid regularly and topping it off when necessary is important. This can help prevent air bubbles from forming in the system and protect against brake failure. A professional mechanic should also inspect your brakes and flush the brake fluid every two years or 24,000 miles. If you find any leakage from the wheel wells, have a professional inspect them immediately.

John D. Archer

John D. Archer is a mechanical engineer and writer based on the area of automotive accessories at, A resident expert and professional, John is passionate about all things automotive and loves to share his knowledge. He has good experience in all kind of automotive accessories. He has worked as a chief mechanical engineer in some reputed automotive garage firm.