Jersey14

Hey new on here, bought a used 14 focus se hatchback a few months back. At first the shudder drove me crazy, i looked here and. i apoligize to poster.. but one post basically took care of it. Wait befor hitting gas and all good!... my only problem is in bumper to bumeper... hard not to roll and shudders on that worst of all.. so next up scrubbing.. only question yesturday i found a small 2 inch black spring under brake pedal.. any ideas where go?!