My brake light works but my tail light doesn't what is wrong

Hello, I'm not sure I understand completely what you were asking. You say your brake lights come on, but they blink? You need to find out if the brake light switch is actually engaging the brake light as needed. My first question is: have you replaced the brake light bulbs with some kind of LED mechanism? Make sure you have original equipment bulbs and sockets installed and no modifications before anything else. Hands on inspection by a local skilled technician is needed. This will not be difficult to diagnose. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops