If you are fitting new pads as well, you will also need to look here.

Legal Limit

On the smart car, the brakes discs are 9mm thick when new. The maximum wear they can have before being replaced is only 1mm. You can measure them with a caliper gauge, if they are anywhere near 8mm or below you should change them ASAP.

Fitting The Discs

You will need the following tools: