What's the BMW error code cc id 71?

The BMW error code cc id 71 means there is a brake pad sensor wear fault. But what role does the brake pad sensor play in Your car You may be wondering. Well the wear sensors are designed to break or complete a circuit once the brake pad has worn enough for the sensor to contact the brake rotor. This is used to gather information such as wheel speed, brake pressure, brake disc temperature, brake operating time and mileage to estimate the life left in Your brake pads.But do they fail Well as brake pad wear sensors are designed to break, they should be replaced as a matter of course every time new brake pads are fitted. It's also advisable to regularly inspect the sensors, in between pad changes, and replace where necessary.