Types of Brake Fluids & Filling a Master Cylinder

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Types of brake fluids and filling your master cylinder. Learn how to replace a truck's steel brake lines, brake line removal, and custom brake lines in this free car maintenance video.

Part of the Video Series: How to Replace Steel Brake Lines
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Video Transcript

In this clip we're going to talk about the proper service procedure to inspect, remove, and replace your steel break lines and bleed the breaking system on a Ford Explorer. In this step we're going to talk about break fluid, the different kinds of it, filling our master cylinder, and bleeding our break system after replacement of our break lines. This is Dot 3 break fluid. They have Dot 4 and Dot 5. You're going to refer to your owners manual to see what fluid you're going to want to use. This Ford Explorer takes Dot 3. I'm going to unscrew the master cylinder reservoir cap and fill it up to the full line. You can see it says max there, and the line above it is the indicator mark. I'm going to go ahead and fill it up. I'm going to have my assistant hop in the vehicle, and he's the one that's going to be actuating the break pedal, while we bleed the breaks. Alright I have my assistant in the vehicle and my master cylinder full. What I'm going to do is demonstrate the process for bleeding your breaks. You have to bleed all the air out of the system, due to the fact that air is compressible and break fluid isn't. If you leave the air in there, you're not going to have any pressure developed. All of your pedal stroke is going to be used to compress the air instead of deliver fluid. So what we're going to do is he's going to apply the pedal down. Go ahead, down. I'm going to crack the bleeder open. There you go, you see the fluid and the air coming out. I'm going to close it and instruct him to come up. What that does is draw more fluid from the master cylinder instead of drawing air in through the bleeder. Go ahead and go down. Go up. That is the proper technique for bleeding your breaks. You're going to want to start with the wheel that is farthest away from the master cylinder and work in order in ascending order to the closest one.

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