Disable SBCS/Brake Assist

2018 Mazda 3
Is there a way to disable the SBCS/Braking system? I drive a manual Mazda 3 with the entire purpose of controlling the car. I am unable to do so when the car suddenly brakes from 80 mph to 60 mph on the highway.
2014 Mazda3 S GT auto, 2008 MX5 6-speed
From what I've read, the system is composed of integrated units:

In case of computer failure, SBC reverts to a hydraulic master cylinder, but driver effort and stopping distance is reported to increase.[3] In case of pump failure the high-pressure reservoir is capable of retaining enough pressure to stop the vehicle electronically.
Are you sure you'd rather "pull the plug"? It may not be that easy.
CX-5 Sports Nav 2.2 diesel auto 2014
On our 2015 Mazda 3 it can be disabled via the infotainment screen. It's similar in our 2017 CX-5 but that one resets so needs done each journey.