Brake fluid flush

Once I got one of these, I've never gone back. Fast and sure. The smaller bottle is a "hamster bottle" that sits upside down on the master cylinder to help keep it filled. As noted above you DO NOT want to run the master cylinder dry and get air in the anti-lock system. The bleeder hooks to your air hose and sucks the fluid out of the calipers. Much faster than any other way. The bleeder bottle is translucent so you can see when the fluid starts running clear. Those who regularly flush their brake system when recommended rarely ever have to replace calipers or master cylinder.

https://www.ebay.com/itm/Air-Pneumatic-Vacuum-Auto-Brake-Clutch-Bleeder-Bleeding-Fluid-Change-Tool-Kit/352275642062?epid=11014536723&hash=item520543b6ce:g:pYcAAOSwv7ldl-gj