Do yourself a favor and buy a brake bleeder wrench.
Although you can bleed your brakes with just a vinyl hose and jar, I found that using a kit like this make the job easier to do and it's cheap.
Remove the rubber cap attached to your brake bleeder nipple.
Place your bleeder wrench on the valve/nipple and then insert the tapered fitting into it as shown above. Attach the jar with magnetic head anywhere below the nipple.
Check your master cylinder in between wheels to make sure that there is enough brake fluid in it. Do not let this run dry.
Bleeding Your Jeep Brakelines

Whether you just installed a set of new brake lines or worked on your brakes in a way that required you to disconnect any brake line, it is absolutely necessary that you bleed your brakes before you drive anywhere. Failure to do so will result in poor to nonexistent braking due to air bubbles trapped inside your brake lines. Symptoms of air bubbles trapped in your braking system include an excessively soft brake pedal or a pedal that goes clear to the floor without any resistance. If you have any of these symptoms even though you have not worked on your brakes, check for leaks, fix where necessary and then proceed to bleed your brakes.

What You Will Need
• DOT3 Brake Fluid
• Brake Bleeder Wrench
• Brake Bleeding Kit or Vinyl Hose & Jar
• Rags
• Someone to Help You Out

What You Need to Do
1. Make sure you have everything you need to get started.

2. Park your Jeep on a level surface, apply your emergency brake and put your transmission into gear.

If you worked on your master cylinder or disconnected multiple brake lines for whatever reason, you will need to start this job from the passenger side rear brake. If you just worked on your front brake lines, then you need to start at your passenger side front brake. The idea is that you just need to start from the brake that is farthest from the master cylinder.

4. Assemble your brake bleeder kit so that it looks like the image to the right.

5. Climb under your Jeep and remove the rubber cap attached to your brake bleeder valve/nipple.

6. Place your bleeder wrench on the valve/nipple and then insert the tapered fitting into it as shown to the right. Attach the jar using the magnetic head anywhere below the nipple.

7. This is where you could use the assistance of a helper. Have them sit in your driver seat with the engine off. On your command, have them push down on the brake pedal slowly but as forcefully as they can.

8. While they are pushing, slowly open the brake bleeder valve/nipple until your helper notifies you that the pedal is on the floor. At this point, close the valve and tell them to release the pedal. Repeat this process as many times as is needed until no more bubble come out. Depending on how much air you have in your lines, nothing may come out the first couple times you do this.

9. When only fluid comes out of your brake system, tighten your bleeder valve closing it off and replace the rubber cap.

10. Check the fluid level in your master cylinder before you continue and refill as necessary. It is very important to NOT let your master cylinder run dry as it will suck in more air and make your problem worse.

11. Proceed to the driver side rear brake and repeat the process.

12. Again repeat the process on the passenger side front and then the driver side front brakes.

That should be it. Please let me know if you have any questions.

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