I understand that I can change my 2009 Impala brake fluid myself. How can I

Hello, Replacing the brake fluid, or flushing the brakes system, is a job that can be done by anyone with some mechanical ability and the proper tools. However, it's not a job I would recommend unless you have some good guidance from someone who fully understands the hydraulic braking system. The main idea is that you want to push the old fluid out and replace with new fluid, leaving no air bubbles in the system. Failure to do this right can cause parts (master cylinder) or brake system failure. Shops generally don't charge too much to do this, so I think it's worth having it done professionally. Just make sure they use a tool that flushed the entire brake hydraulic system. If you wish to do it yourself, I suggest getting an brake bleeding/flush tool and perform a search online for "How to flush brake system" and you'll see pictures, maybe even video on how to do this job. I do not suggest using the brake master cylinder to push the old fluid out of the system, this can damage it. Good luck!

get a turkey baster and suck the fliud out then fill with new fliud then bleed all wheel to get all the old fliud out of lines and calipers