Can't get tag on vehicle renewed due to co-signers unpaid traffic tickets- In Florida?

My brother co-signed for me on my vehicle. I went to renew my tag and was unable to do so because my brother has unpaid speeding tickets that he got in his car (different from my car)... Is there anyways around this? I am the only one that drives this vehicle and i pay for it by myself, i just needed him as a co-signer because my credit wasn't good enough at the time. His tickets equal to about 800.00 and i cant pay that. What should i do?