I fucking did it again, just a few minutes ago. This time on a bike. I had the old brake pads out, i leaned on the handle bar to stand up and get the new ones because I’m old and managed to bump the brake handle against the wall with my body weight. The caliper piston shot out of there and mineral oil is all over the place, all over the rotor, all over me. So now i need to order a bleed kit for a bike, which I’d need eventually anyway but I’m just annoyed because I made this mistake years ago on a prius.
I was changing a lug stud, they need to be in the 12 o’clock position to come out but I had the car in park and only jacked on one side and the caliper was already hanging by a bungee cord. As I went to put the car in neutral I pushed the brake without thinking and I hear a thunk followed by a metallic rolling noise. I shot the caliper piston across my driveway. So as soon as it happened on my bike I fucking new exactly how I fucked up. Typing this out has calmed me down, lol. I use arch btw.
TLDR: I tried to change brake pads and shot out my caliper piston. Again.
You can still buy rim brakes, they are just aren’t very good at their primary function. Also if you find disc brake pads harder to change than rim brakes I think you are doing it wrong!