That is called a Torx bit (those three servo removal screws). They are identified by a number - basically, the larger the number, the bigger the bit. OK , I just did this on my friends Model S; the Torx is bit number T-25. And the open end wrench to turn the star thing is, first, a 13mm to get it moving, then, a 14mm to turn it the rest of the way. Thanks for your video, it helped a lot!

It's the second time my parking brake has locked up and I'm now going to try to fix it myself cuz I'm not in warranty anymore thanks for your video it's inspiring

Great work, even made it work again 👍

What kind of lubricant did you use?

Very likely that there is a lot of corrosion inside the planetary gearbox. Though you have freed it up for now, it will likely stop working again. You can separate the motor from the gearbox and clean up the gears and the face of the motor as that has probably corroded too.

Merci pour cette vidéo ! Tu m'as beaucoup aidé :)

How did you know which is the one locked up? Did you check all four wheels? Thanks for the help.

Edmond, at first thank you for the video. I'm having the same problem, the gear is not moving. You said in the video that you put some "loop" in the gear and then it started to work again. Could you tell me what's loop? sorry but I'm not a native speaker so I don't understand. Thank you

Well done Ed

how did it end, did it help for a long time?

I tried to fix my Model X parking brake, but I can't loosen ist. I uninstalled the actuator motor, as shown in the video, and the motor turns. But I am not able to turn the gear on the wheel side. I applied as much force to the gear, using a screw wrench, as I manually could, until the wrench slips off. The little gear isn't moving at all, and I can not apply more force. Any idea, how to loosen the parking break?