OK, here goes:
Autobrake Selector, Brake Pressure PSI, Deceleration Rate in ft/sec/sec :
1, 1250, 4
2, 1500, 5
3, 2000, 7.2
MAX, 3000, 12 ft/sec/sec below 80 kts
MAX, 3000, 14 ft/sec/sec above 80 kts
RTO, FULL System pressure, Deceleration Rate Not Controlled Brake Pressure is Max System pressure with "on ramp"
There is an "on ramp" period where Autobrake pressure is applied over a period of time. Approximately 750 psi is applied in 1.75
sec then above mentioned pressures are reached in another 1.25sec for Autobrakes 1, 2, or 3 and approx. 1.0 sec for MAX. There
is a logic that says average wheel speed must be greater than 70kts to initiate Autobrakes. There is some confusion that it takes more brake pedal pressure than is being applied by the Autobrakes to disarm. A more accurate statement is that it takes 750 psi of brake pedal pressure at the brake shuttle valve to disarm any
Autobrake/RTO application. I hope this information is helpful.
The Autobrake system is much more complex than two paragraphs can describe.