How to Jailbreak iPad Air 2, Air, 4, 3, 2, Mini Using TaiG iOS 8.1.1 (Windows)
Create an folder on your desktop and download the latest version of TaiG into the folder. If your download is a zip file then extract the archive into the same folder.
Tap Settings from your Springboard then select Touch ID & Passcode. Turn Passcode Off if it is enabled.
Choose iCloud from the Settings menu then select Find My iPad from the iCloud menu. Ensure the Find My iPad switch is the Off position.
Connect your iPad to the computer via a USB cable, launch iTunes, and perform a manual backup. It is very important that you remember to backup your device before continuing as you could lose your data if the jailbreak process does not complete successfully.
Double click the TaiGJBreak executable from the folder on your desktop to launch the application.
You will notice the device is detected by the software. Uncheck the bottom checkbox to prevent the TaiG App Store from being installed then click the large Green button to begin your jailbreak.
The TaiG app will now begin the jailbreak process.
Once the jailbreak has completed successfully, you will be shown a green smilie face, your iPad will reboot and a Cydia app will appear on your Springboard. Congratulations, you're now jailbroken!