Green Brake Fluid: Why & What You Should Do?

The brake fluid turns green so you must be wondering what this could possibly mean? Something doesn’t quite seem right, does it?

Don’t worry! This article will explain what that green fluid means and what you can do to prevent it.

What colour is brake fluid?

It is typically clear with a slight yellowish tint, depending on what kind of brake pads in the vehicle, the fluid’s age, and what brand it is. The colour can certainly change as well if there have been any problems with the brake system.

Why is my brake fluid green?

The most likely reason that it has turned from its regular clear colour to green is that it has been contaminated by the fluid chemical components breaking down and attacking the brazed joint in the brake tubing. If copper levels are high enough in the fluid, it will typically turn green. This is often caused by brakes that are not checked regularly enough or by the incorrect replacement of brake pads.

Another reason your brake fluid could turn green is that moisture has infiltrated the system. The fluid is hygroscopic, meaning it attracts and holds water molecules. As the water content in it increases, the boiling point decreases, which can lead to brake fade – a condition where the brakes don’t work as well as they should because they’ve overheated.

  • Is this dangerous?

If your car’s fluid turns a colour other than what is typical for the type of brake system you have (typically clear), it is definitely a cause for concern.

What should you do if your brake fluid turns green?

Generally, it can be flushed and refilled. The first thing you need to do is find a brake specialist who can test the integrity of your vehicle’s hydraulic braking system. They can determine what’s causing the fluid to be turning green and whether it needs new parts. If no damage has been done, then the vehicle should be fine after a fluid flush and refill.

However, if the brakes have been compromised, it’s important to take your vehicle in for repair as soon as possible. Continuing to drive with contaminated fluid can lead to serious and expensive damage.

Be sure to keep an eye on your fluid levels and change it according to your vehicle manufacturer’s guidelines. Additionally, have your vehicle serviced regularly to avoid fluid contamination in the future.

How do I check brake fluid?

Checking your brake fluid is a simple process that can easily be done at home. All you need is a rag, some engine degreaser or brake cleaner, and a funnel. Besides, make sure your car is parked on a level surface and the engine is turned off before you start.

  • Open the hood of the car and locate the brake master cylinder. The brake master cylinder is usually located on the driver’s side of the engine compartment, near the firewall.
  • Check fluid level – The fluid level in the master cylinder should be between the minimum (MIN) and maximum (MAX) fill lines. The ideal fluid level is at or near the maximum (MAX) line. If it is not, then you will need to top up your fluid levels with the vehicle manufacturer’s recommended type of brake fluid.
  • In case your vehicle has an ABS system fitted, it is important to make sure that your vehicle manufacturer recommends you use one made for anti-lock braking  systems. If the vehicle does not have an ABS system fit, then you can use a normal type.
  • Check fluid colour – If it is green and/or contains glycol ether, it could be contaminated and should be checked by a professional for safety concerns

How long should I change my brake fluid?

Vehicle fluids have a standard life and will need to be replaced at certain intervals. How often you replace them depends on the vehicle manufacturer, driving style, and type of fluid used.

In general, it usually needs to be replaced every two years or 38,000 Kilometers, whichever comes first. If you drive in a very dusty, dirty environment, then it is recommended that vehicle owners replace the fluid every year. In more severe conditions, vehicle owners should change it every six months or 19,000 Kilometers.


You shoud be aware of green brake fluid. Thanks to this article, you now know what green brake fluid means and what you should do with it.

Also, make sure to pay attention to the brake fluid and change it at the right time!

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