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How To Replace Your Master Cylinder

By Matthew Wright, About.com

3 of 6

Loosening the Brake Lines

Use a flare wrench to loosend the brake lines.

Loosen the brake lines, but don't remove them just yet.

Thanks to Tegger for photo help!
If your car has a "low brake fluid" sensor in the fluid reservoir cap or any other wiring (such as ABS) on the master cylinder, unplug them.

Now take your flare wrench and loosen all four brake lines at the master cylinder, but don't unscrew them all the way yet! You want to leave them in there just a little bit. You'll see why in the next steps.

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