How Much Brake Fluid Needed to Flush System Wrx

Your Subaru WRX might be a great car, but it doesn’t mean it doesn’t have some quirks. One of those quirks is that the brake fluid needs to be flushed every three years or 36,000 miles, whichever comes first. Flushing the brake fluid isn’t a huge deal, but you do need to make sure you do it correctly in order to keep your car functioning properly.

What is brake fluid and how is it used?

Brake fluid is a type of fluid that is used to help stop your car. Brake fluid is squeezed from brake drums by the pistons in the brake system. This fluid is then sent to the brakes and helps to slow or stop your car.

How brake fluid gets into the system

Brake fluid can get into the system in a few ways: through the brake pedal, from the master cylinder, or from leaks in the system.

The most common way brake fluid gets into the system is when someone pushes on the pedal while the car is still moving. This causes the fluid to flow into and through the brake lines, into the master cylinder, and then out onto the road.

Brake fluid also can get into the system if there are leaks in the lines or fittings. For example, if a hose connects the brake line to the master cylinder, it can leak. Or if a fitting on the line is loose, brake fluid can leak out of it.

When brake fluid gets into the system, it can cause several problems. First, it can make it difficult to stop the car quickly. Second, it can make it harder for you to stop on a wet surface. And finally, it can cause corrosion in parts of the system.

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When should you flush your braking system?

In many cases, a brake system flush is not necessary. However, brake fluid can become contaminated with mud, dust, and other debris over time, which can cause the system to malfunction. In addition, brake fluid can also become diluted if it is not used regularly. So it’s important to determine when a brake system flush is necessary and to use the right amount of fluid when performing one.

What to do if you don’t have enough brake fluid

If you don’t have enough brake fluid in your Subaru WRX, there are a few things you can do to flush the system and get more fluid into the lines. One option is to use a can of brake fluid that is two-thirds full or less. This will dilute the existing fluid in the system, and hopefully help to refill it. Another option is to use a turkey baster or syringe to squirt brake fluid into the lines at a slow rate. This will also help to refill the system.


If you have a Subaru WRX and are experiencing a lack of performance or brake fluid leaks, it is important to flush the system. The process of flushing the system can help to restore lost fluids, clear any debris that may be causing problems, and increase brake performance. Instructions for flushing your Subaru WRX’s system can be found below.

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