On an RTO in the 737, after stopping, max brake pressure will continue to be automatically applied while the speedbrake is UP. The evacuation checklist calls for the parking brake to be set as the first item in order to prevent aircraft movement because the second item is speedbrake down which releases the brake pressure.
The above assumes auto brakes RTO to a stop. If manual braking is applied during the RTO then the auto brakes disarm and the brake pressure after stopping is controlled by pilot input not the autobrake system
Last edited by Matey; 29th Dec 2021 at 22:46.