Cutting Front-to-Rear Brake Lines

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How to cut front-to-rear brake lines. 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 brake lines and bleed the braking system on a Ford Explorer. In this step we're going to talk about cutting of our front to rear brake line and removal of the fitting from the proportioning block. The front to rear brake line runs along the frame here on the inside of the frame to protect it from road debris. The proportioning block is located just above my jack stand. The line actually runs all the way down through a series of clips over the gas tank and back to the rear hose. Let's slide under here and cut that connector. I'm going to use my wire cutters to cut it. Alright, what I'm going to do is take my side cutters and cut this line off right there. I'm going to put a socket on the fitting and unscrew it from the proportioning block. I have the line cut right now as you can see. I'm going to bend it out of the way. Go ahead and take my quarter inch socket wrench with my socket on it put it on the fitting and unscrew it. When you reroute your new front to rear brake line, this is it here, you're going to want to use all of the factory hangers and connectors. There's one there and one there and they continue running up and down the frame. That's what holds your brake line to the body. They make them out of plastic so the metal to metal contact doesn't rub through. Now that I have the old brake line out and the fittings all broke loose and my fittings salvaged I can take and make the length of the line that I need. What I have here in my hands is called a union. It's what you use to connect two hydraulic lines together. You can see how it has the flare in there for sealing and it's identical on the other side. What this does is join two large sections of brake line together. I'll screw it down just like that and get my other fitting and wind it up and screw them together. Alright it takes a three inch and a twelve millimeter or a three eighths and a twelve. Tighten it up just like so and repeat the same procedure for your other line. You want to make sure to tighten these on the vehicle or off the vehicle. If not when you route your brake line it may be concealed under another component or above the gas tank or something like that which will inhibit you from getting at it and you'll have to disassemble the whole system again and then torque your union fitting. I'm going to slide underneath the vehicle now and route my new brake line. You're going to want to make sure to follow all of the factory clips and connectors and to bend your new brake line to fit the contour of where your old brake line was. And like I said it's very important that your brake line follows all of the factory clips and to connect them in the same fashion as we did the rear lines. We're going to go ahead and screw them in lefty loosey, righty tighty and tighten them down. Alright I'm going to make the last connection for my brake line here. It's a lefty loosey, righty tighty kind of bolt, just going to take and screw it in to my new brake hose. Well as you can see these can be a little difficult to get started but you have to get it started straight. If you try and wrench it down crooked you will strip the fittings out and have to replace them again. Alright I'm just going to take a three eighths wrench to tighten it down, going to slip it on there and turn until it's tight. Alright and right there. That is the proper way to reinstall your front to rear brake line and seat that fitting.


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