I would like to measure the force with which the bolt (dark blue) pushes on the break pad (grey) to stop the wheel (light blue). I am thinking that I could put some component between the bolt and the break pad (red part). There is about 1 cm gap between the bolt and the brake pad, when the brake is in neutral. I'm thinking I will use an arduino to read the value.
What kind of component can I use? A strain gauge on the side of the red component, or maybe a capacitor that is compressed?