Please help: ML320 brake pedal
 

Yesterday whiledriving on a California "rush hour traffic" freeway, I had to press on my brakes pretty hard but not to the point where there was skidding/burning rubber smell. Later that day and today, a clicking noise is now present when I press on the brake pedal. I can actually feel the clicking on the sole of my foot.

Any ideas what it can be/part number/etc?

Is it a simple adjustment that I can door is it "dealer" time? [/align][/align]Most importantly, am Iendangering myself driving it like this?[/align][/align]Thanks.[/align]