Clicking sound every time press brakes

I purchased it in 2007 with 46,000 miles. Until 11/10, I drove only city miles; 5-10 miles a day. In 11/10, I moved & I now drive highway miles. There's a clicking sound every time I press my brakes that lasts until I come to a complete stop. The heating blows cold, the ac blows hot; the oil light keeps coming on when I know I have oil in the car; there was a loud, bubbling sound as I was idling at a red light. Any ideas what might be wrong or what it would cost to fix? In august 2010 I got all new brakes, rooters, brake pads, etc. But I feel like they're grinding. Is it possible I need new brakes again?

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