Changing rear brakes 2005 freestar

3 leg hub puller when they are stubborn. Videos.

https://www.google.com/search?q=2005+Ford+Freestar+4.2.+How+to+replace+left+rear+hub

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Sounds like one of the doors are not closing all the way!
If not closed completely there is not good contact at the switches making it seem like a door is partly open when breaking!
Check all doors for tight close and adjust or repair. Including rear hatch !
Also look at the information center on dash (if still lights up) it should say which "Door is Ajar" when the beeping\lights flashing is occurring.

You could try striping and cleaning the caliper then rebuilding it if you are able to get a kit to replace the rubber parts and pistons that are damaged

There is air in the brake system and must be bled. They have devices for bleeding the system...basically you need to replace the air with fluid. Hope this helps !

I am having this same issue. I have changed my brakes and now I was going to change the front wheel bearing, but unsure to dump a lot of money out on an unsure fix.
Let me know if anyone has a fix?

Changing brake disc is a lot of work. Why not just go to your mechanic so that it will be more accurate and functional. But if you really want to know it. I have researched a video presentation for it at here.

I'm assuming all of the brake lights are on? If so there is a brake light switch located way up under the dash that hits on the arm for your brake pedal. If this is not "closed" when the pedal is up (not depressed), your brake lights will stay on. It is adjustable.

Use a vacuum pump brake bleeder starting at the furthest point from the master cylinder. They cost abt $35. Be sure to keep master cylinder full... :)

new calipers now. and i had to replace both discs. Ford Freestar is renowned for it's rear brakes wearing prematurely.

anyway, after forcing banging, and utterly destroying two heavy duty c-clamps, i check forums and found you MUST rent a tool from an auto parts store (mine was free loaner from Checker, just had to give them $80 and bring it back undamagaed, they give you back 100% back). Anyway the tool twists the calipers as it pushes them back. you cannot just force the calipers back with straight force.