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In my Opinion your Brand Name should not be in your Titles. At least not on all pages. It should be in Contact pages, in pages and articles texts but it titles not that much. The reason I'm saying this is that there is 2 possible options : 1- Your Brand is not so well known so why trying to rank for your Brand when you could target a more efficient Target in term of relevant traffic generation. 2-Your Brand is well known, so that it is probably already in your Domain name and the texts everywhere everywhere on your sites, in anchor text of incoming links. You probably had a website running for this brand for a while so that Search Engine knows that your web property is the one of your brand. You probably also have a lot of links pointing to your homepage with your Brand for Anchor Text. Search Engine will then know. So instead of focusing on your Brand, I think it's more clever to focused on bringing visitors and customer by using Keyword related to your products and services and have a larger base of customers to get awareness of the brand and then promote and recommend your Brand !

I can say with almost absolute certainty that using trademark or restricted symbols isn't going to harm your rankings.