front factory caliper-- I rebuild.
Reason being that most of those low-end reman ones such as cardonne, etc. they took on some dirty/rusty cores back, sand-blasted the protective coating off the calipers before they begin their work (inspection, rebuilding, etc.). When they are done, they usually spray on some sticky oil to protect them from rusting during storage.
Once installed onto the vehicle, they would begin to rust again, causing all kinds of seizures and issues in short notice. I had Sumitomo calipers (reman installed on Mazda) seized up within 8mns past installation, due to lack of protective coating.
Toy (Aisin calipers) also suffered from that problem also, but not to the point of seizing up.
Rear wheel cylinder , I buy fresh new aftermarket ones and then clean out the bore (one more time) before installation. There's no hope of honing and then re-building with fresh new rubber cups, springs w/o developing leaks in short notice.
Q.