The parking brake in your Mercedes-Benz is an important part that helps ensure your car does not roll when you have it stopped. It's an extra security feature that is especially useful to engage when you're parked on a hill or incline so that you can prevent your vehicle from rolling. The parking brake is something that you want to maintain so that you don't have issues engaging it when you need to. The parking brake cable is what helps you engage this part on your vehicle, and over time, this cable can become worn out. Any issues with engaging the parking brake is likely an issue with the cable. You want to be sure you pay attention to different signs that your cable might be failing. If the parking brake is not pulling as tightly, this can indicate that the cable is worn. If the parking brake does not function at all, this is another obvious sign. If you need a replacement parking brake cable, we sell OEM ones for Mercedes-Benz models here on our site.