How To Remove Brake Fluid Reservoir From Master Cylinder? [5 Easy Steps]

So, you are having trouble with your car’s brake fluid reservoir? Do you want the right solution? Ok, you have stepped into the right place because this article has the solution to the problem related to brake fluid reservoirs.

The hydraulic clutch of almost all current vehicles works through a master cylinder. When you press the clutch, the hydraulic fluids from the master cylinder enter the slave cylinder through a copper tube. If for some reason the slave cylinder breaks down, it leaks and fluid bleeding occurs.

In this article, we will discuss how to remove the brake fluid reservoir from your car’s master cylinder. As the discussion progresses step by step, you will succeed in your task if you follow the steps properly.

Why Would You Need to Remove the Brake Fluid Reservoir?

Brake master cylinder reservoir or brake fluid reservoir, whatever you say, is made of polymer plastic. Over time, the plastic reservoir is damaged and eroded in various ways. At one point it becomes brittle and cracks form. Brake fluid leaks through these cracks.

Did you know that the fluid used in brake reservoirs is hygroscopic, which means it absorbs water? Moisture enters the reservoir through the cracks caused by corrosion and contaminates the hydraulic brake fluid. As a result, the contaminant hydraulic fluid reduces the boiling point and greatly reduces the braking performance of your vehicle. 

However, cracks in the reservoir are not the only thing for which you may need to change the brake fluid reservoir. If your vehicle’s venting or diaphragm is damaged, the brake fluid reservoir cap may need to be replaced. It is because the reservoir cap cannot seal moisture if the venting or diaphragm is damaged. This can also cause problems with the brake performance of your car. 

Requirements to Remove the Brake Fluid Reservoir from the Master Cylinder

You do not need much equipment to remove the brake fluid reservoir from the master cylinder. The only tools you need to have are:

  1. A vise and
  2. A screwdriver that has a flat head/a pry bar.

How to Remove the Brake Fluid Reservoir from the Master Cylinder?

Those who have a rough idea about the car and the parts of a car will face difficulty while completing this task. However, it may be a little difficult for those who have never done this kind of work before.

No problem, because our article is for everyone who wants to remove the brake fluid reservoir from the master cylinder themselves. Just follow the steps discussed below properly.

Step 1: Raise the Hood

First, you need to understand the part of your car that has the problem, that is, find out the area. The master cylinder exists in the engine chamber of the car which is located under the hood. So you have to lift the hood. In this case, care must be taken so that the hood does not fall on your neck or head. Notice a wand under the hood with which you can prevent it from dropping.

Step 2: Locate the Main Cylinder

Now, you need to find the master cylinder. If you have no preconceived notions about automotive, you need to be careful because you do not know what is under the hood. Basically under the hood, the master cylinder will be right next to the driver’s seat. It will be mounted close to the firewall and made of either metal or plastic. Look, four hoses are attached to the cylinder and the brake line is connected to it.

Step 3: Protect the Cylinder with a Vise

Did you get the master cylinder? Then look at the next step. All you have to do is ensure the safety of the master cylinder. For this, you have to stick the vise with the cylinder. This will make the cylinder steady and safer. Remember, if you don’t clamp the vise, the whole task will be quite difficult for you.

Step 4: Slide the Screwdriver/Pry Bar

Now that you have firmly fixed the safety of your master cylinder, slip a flathead screwdriver or a pry bar right in the middle of the brake fluid reservoir and the cylinder. In this case, both caution and stability are very important. At the same time, make sure that the device you are utilizing is up to standard because if the components you are working with are damaged, then both your time and money will be wasted.

Step 5: Nudge the Reservoir Apart

Notice that when you insert your screwdriver or pry bar through the cylinder and reservoir, it will detach from the cylinder as soon as you push the reservoir. So, do that, that is, separate the reservoir from the cylinder. When done, see there is a rubber that holds the two objects together, remove it too. Ta-Da! Your task is complete!


The brake system of every car is very flexible. Therefore, the advice and help of experts should be taken even in the slightest problem. However, we believe that you can easily remove the brake fluid reservoir from the master cylinder by combining the basic knowledge about automotive and the information in this article. However, if in any case, you are unable to complete the task, you must seek the help of the nearest skilled mechanic. Have a safe drive.

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