Originally Posted by
Psimet2001
That's contamination. Unless I missed something you haven't been changing your rotors. New rotors and pads at the same time so you don't contaminate them.
Now you need to make sure you aren't cleaning the bike with anything that is getting on the rotors. Also chain lube. You'd be surprised how chain lube can get everywhere at speed.
I agree. I had an issue with a pulsating sound when braking on the front on my first SRAM AXS bike. Shop checked the headset, checked the rotor for trueness, retorqued the center lock, but nothing worked. Their probably was contamination so the shop switched out to new pads but not rotor and that worked initially but pulsating game back. It wasn't until I swapped the front rotor with new pads did it entirely go away, which brings up your point that contaminated rotors can spoil clean pads and vice versa.
I have switched to wax and really try to avoid riding in the rain in fear of contaminates