I told him I have a friend with a Model 3 and I'll just check his brake pedal to see if it feels the same. Finally, he offered to take a look at it again if I brought it in. He also confirmed the car was test driven a lot after the repair (invoice showed 6 mile difference between in/out odometer), which seems like plenty to me.

Sure enough, 10 min later my cell phone rings and I'm speaking to the man that was actually working on my car! He said that since changing the booster really opens up the brake system so they were overzealous with the bleeding procedure. I'm thinking, yea sure, the chat agent is going to have the ability to locate my tech and have him call me. I said 'a tech' or 'my tech'? She said she could have him call me. She said she wasn't able to check that, but asked if I'd like to speak with the tech. After mentioning the repair I just had done, I asked if it was possible for them to remote into the car as maybe % brake pedal travel is something they could see in the logs to see if it's abnormal. I went to and started a support chat session, I had someone in the chat in about 10 minutes. It was as if there may have been air in the lines. When I started driving my 3, I noticed a lot of brake pedal travel, I wasn't sure if the pedal should feel stiffer. I did not have a day go by when I didn't receive at least 1 text update, and they always responded to my replies within an hour or two. This is from a service center in a major metro area. Sure enough, around 11:30AM, received a text that the car was ready to be picked up! Less than a week after I dropped it off! As a bonus, they charged me up to 80% and updated me to 50.6. Then, on the morning of the next day, around 9am, I got a text that they've started working on it and expect to have it ready by the afternoon. The next day I got another text saying it's still queued for the shop. Sure enough, the next day I got another text from the SC saying they received the part but there were a few cars ahead of mine for the shop. I was very pessimistic, expecting THIS to be the bottleneck to get my car back. The next day I got a text that they confirmed it's the brake booster and they've ordered the part.

They gave me a new Model S 75D with 300 miles on the odometer as a loaner and sent me on my way. He said it was likely the brake booster, a part they didn't have in stock because it's not a common repair. Turns out, they had a tech check out the car within ~15 minutes of my arrival. When I mentioned they probably won't have an appointment for a month, she said 'No worries, I'll reach out to them to let them know you'll be on your way to see them in a couple hours.' When got to the service center, I expected them to take my key and give me a loaner since I knew they were so busy. She offered to have it towed to service if I didn't feel safe, but I said I could drive it. She saw a warning that regenerative braking was disabled and saw the 'brakes' warning light. I was really pleased to be speaking with someone after only a 10 minute wait, the same person that took my call was also able to remotely connect to the car and check it out. Once I arrived I called Tesla's support number to explain what happened. I drove my short commute to work without a problem, just being extra safe. I DID have brakes, but just no power assistance. I pushed harder on the brakes, and the pedal started to vibrate as if the ABS was working, but the pedal was only traveling 20% of its normal range. An orange 'brakes' warning indicator was lit up on the display. I noticed the car creeping forward (I have creep off) until I realized I was just slowly rolling down my driveway. Got into my car one morning when it was about 35F outside, pushed the brake and move the stalk down to drive.

Tesla ibooster