Don't run them this low because it messes with the rotor and as shown below throws off the piston alignment which means one side pushes the rotor against the insides of the caliper wearing away bit of the body. These are a bit of a pain to replace as wheel removal is necessary though protip it's easier to just remove the caliper. The rear brake was so bad I thought I needed to bleed them but after putting in new pads they work like new. I replaced them with Tektro P20.11 from Ebay but they are a Shimano standard size so you can use other brands. I estimate these pads had over 3400 miles on them and probably should've replaced 500 miles earlier.