Boys and Girls! This is the holy grail of vehicle safety and performance. It doesnt matter how fast you can get going if you can't stop your ride! You've already been let loose on some brakes with plenty of guidance and exposure. There are some things you can spot with your eyes, but there are others you need measuring equipment for. These two are: Thickness and Runout(wobble). Check out the links below and come to class prepared for some disc brake system(the most common) research, disassembly, inspection, and reassembly. The links below should be a general overview of how to check for these types of wear.
tools to use: Dial indicator with stand
Dial caliper or Micrometer
IMPORTANT!! You must consider your safety first... Asbestos is assumed to be present while working with braking systems. Be sure to read the article below on asbestos exposure pertaining to cars.