How To Replace A Brake Master Cylinder?--Zhejiang jingke auto parts co.,ltd.
2013-12-17

How To Replace A Brake Master Cylinder

The brake master cylinder, indeed the whole brake system, is probably the most important part of your vehicle. It is a fairly easy job to replace and something a beginner can easily do.

Most of the time, if a brake component needs replacing, it leaves a trail to follow. This trail is made of stinky brake fluid. That's the good news. Following a trail of brake fluid will usually lead you to a current or future brake problem. There are lots of brake components that can go bad. You've got wheel cylinders, master cylinders, discs, boosters, ABS systems and even brake pads. Any of these things can make your brakes more exciting than you ever hoped. Excitement is not something we want out of our brakes.

Tools and Materials

·                        Wrenches

·                        Screwdrivers

·                        New or Rebuilt master cylinder

·                        Brake cleaner

·                        Brake fluid

·                        Brake lube

·                        Safety glasses!

Step 1 - Preparation

Park your car on a flat surface. Make sure the vehicle is in “Park” with the handbrake on. Spread layers of old newspaper under the engine to catch any brake fluid that drips. Use a brake fluid removal tool to take out the fluid from the reservoir until it’s empty. At this point, you’re ready to actually begin your brake master cylinder repair. Unclip the sensor from the reservoir

Step 2 - Removing the Master Cylinder

To remove the brake master cylinder, use the line wrench to loosen the brake lines and remove them. This tool will do a better job than a regular wrench. When you’ve done that, locate the bolts holding the master cylinder to the body of the vehicle. You’ll need to use your socket wrench to loosen and remove these. Lift the master cylinder out of the car, and plug the holes for the brake lines with clean cloths.

Step 3 - Retrieving the Rear Master Cylinder Seal

With the master cylinder removed you'll be able to see the rod that pushes the piston in the master cylinder. If it didn't come off with the master cylinder, there will also be a seal around the pushrod. Remove this seal. If your master cylinder came with a new seal you'll be replacing it. If not, clean it up for reuse. It still needs to come out temporarily.

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Step 4 - Reinstallation and Wrapping Up

Now that you've removed the old master cylinder, you're ready to install the new part. But before you do, it's a good idea to bench bleed the master cylinder. It's much easier to get the air out now than later.

It goes in just like it came out, so in the words of service manuals around the world, "installation is the reverse of removal."

Once the new part is installed, you'll need to add new brake fluid (never try to reuse the old stuff) and bleed the brakes.

Step 5-Bleeding the Brakes

You’ll need help to do this properly, as you operate the brakes, and someone else opens and closes the bleeder valves on each wheel until there’s no more air in the system and the fluid is clear. After that, you’ll fill up the reservoir again and check the brake pedal operates normally before driving the vehicle.