Brakes! Not today, but last two weeks I replaced front pads with semi-metallic and did a full fluid replacement.
For pads, I'm a firm believer in semi-metallic over ceramic. Ceramics last longer sure, but I believe it's at the expense of rotors, at least on some vehicles. (In particular the Toyota and Honda minivans we've had) I'm guessing many "warped" rotors are replaced when they may not be truly warped, just a glaze from ceramics that can cause skipping, which feels the same as warped rotors. Had that pulsation on our Toyota a year ago, replaced pads, didn't touch rotors, after a few 100 miles, pulsation went away. Downsides to semi-metallic: more dust, maybe more noise, don't last as long. But I'd rather live with those things (don't really notice anyway) and replace pads more frequently while having better, smoother stopping and changing rotors less often. Here's what I used, like them so far:
https://a.co/d/8IZZq4F
For the fluid changeout, I was thinking about having a shop do it since I hate bleeding brakes, but I bought this HF number instead:
https://www.harborfreight.com/pneumatic-air-operated-brake-bleeder-with-auto-refill-kit-57057.html I recommend it. Way better than those hand pump kits. Uses your air compressor to create a strong vacuum (it must use the venturi effect to do so). Also comes with an auto-filler for the master cylinder which keeps it full, allowing one-man brake bleeding. And finally you can use the vacuum mechanism to suck out the old fluid out of the M/C, down to the last drop. Everything worked well for me. As many of the reviews point out, you never really see solid fluid flow in the discharge hose, lots of air bubbles, but you just have to get past that - I'm sure it's sucking air past the threads on the bleeder and where the rubber nipple attaches to the bleeder (even though I used silicone grease like the instructions said) Once you realize the strong vacuum you're using won't allow air to go back into the brake lines, you just watch for the fluid to turn clean in the hose and you're done. Rock hard brake pedal after all four corners.