If these go into emergency brake, I cannot get the brake pressure back to 90. I don't recall having this problem before. Usually, just have to set throttle to idle, reverser to neutral, independent brake to full, wait a minute or two, then release Auto brake, pressure starts to rebuilding. All of a sudden this is not working any more. The pressure builds slowly to about 40, and stops. This is on the San Francisco to San Jose Route. Any help would be appreciated. Thanks