[angersock]

Ah, but what about anti-lock brake systems?

[dmm]

Anti-lock brake systems work by reducing hydraulic pressure at a wheel that is determined to be slipping. It doesn't affect how braking is activated.

[angersock]

A little black box regulates the applied pressure due to criteria X.

I submit to you that if X is buggy, the little black box may decide never to allow pressure to hit the brakes. This in turn prevents braking.