I put new (I think Ate or Brembo, cannot remember) last year on two cars. The 123 car also received new calipers and is fine -my 126 car has a warped rotor which no doubt came from a sticky caliper overheating the rotor. I did a flush and thought that I could get caliper to respond positively -nope! Now I will need to pull and machine if possible after replacing two new rebuilt caliper units . . .