Abs activated,continuous noise from firewall area.What would cause this problem?

There is air in the break lines and the lines you have to bleed are located on the driver side .There is a control module oder the driver seaton the inside part of the frame. There are 5lines that go into this antilock module you will have to bleed tha 5 of them .One at a time that should take care of your problem. Ps you may have to do them afew times and you will need someone to help you to pump the breaks and there are bleeder screws you have two bleed from the nut on each line. Hope this helps fbchase.