You have ABS correct? If you do this PDF file might be helpful. You'll need "Adobe Acrobat" to view it (free ont the web). Click
HERE to download the ABS (antilock brake system) file. Let me know if it helps. A "code reader" may be just the thing also. You can usually find one at places like "AutoZone" for 30-50 bucks. It's a good investment, because you'll probably use it numerous times through the ownership of your Thunderbird. Good Luck!
-Jeff
:)