Kenchan is correct about the exhaust and the ticking noise that you hear. It is just the metal shrinking from cooling. Most likely the heat shields cooling at a faster rate than the exhaust piping. Totally normal and nothing to be concerned with. 2 of the three cars in my garage do that. My Eclipse with aftermarket exhaust does not tick. That's why it must be the heat shields.
As far as your braking issue goes, is it possibly the road that you are driving on. If you are driving on an asphalt road with depressions in the tire tracks caused by big heavy trucks then that could do it. If this still happens on a flat concrete road then it must be your brakes or possibly an alignment issue. Make sure your calipers are not stuck.
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