The brake discs work with the brake pads to slow your Citroen C5 down by applying friction. Over time these wear down and require replacing to give you optimum braking, keeping you and other road users safe. You may find that as the discs wear, you will start to feel a vibration through the steering wheel under braking. This would indciate that your brakes need changing. If you need to replace your discs then orangespanner hold large stocks to suit all budgets.