Hello, I have a 2004 getz 1.1 gsi 48,000 miles. I have recently noticed a knocking noise from the rear near side brake. It only happens when the brake is applied and slows as the car slows as if it is related to the turning of the wheel. i.e one knock for each turn of the wheel. Does anyone know what the problem might be? Is it easy to fix or will I need to take it to a garage?