https://www.cnet.com/roadshow/news/elon-musk-model-3-braking-fix-over-the-air/

According to Musk's tweets, the problem that led to inconsistent braking results "looks like" it can be fixed with an over-the-air firmware update. In traditional Musk fashion, he also used that tweet to promise that, in time, the Model 3 will out-brake the competition.

While you might be wondering how larger brake pads and calipers can be sent to owners over the air, it's not exactly the hardware's fault. According to a different Musk tweet (it's hard to keep track of all these), the problem is likely due to the calibration algorithm in its antilock braking system. Thus, an over-the-air update can potentially remedy the issue, although if you intend on taking your Model 3 to the track, it's still a wise idea to upgrade the pads and rotors to more durable versions.