What is the correct procedure for the 'stab braking' emergency stop method?

AAMVA CDL Manual, Section 5, subsection 5.4.3, p. 5-8; 49 CFR 383.111(b)(7)(iii) (Emergency stops)

Locked wheels mean no steering control, so the release-and-reapply cycle of stab braking is what lets a driver regain the ability to steer during a hard stop. Getting the release timing wrong, releasing too soon or reapplying too early, defeats the technique entirely.