Originally Posted by Wattsup

But wouldn't there already be an invisible thin film on the rotor that had been laid down previously from the pads that I am replacing? Hmmm. It seems that Part Tool thinks something else is involved:

"New disc pads may require a “burn in” period. Solvents from manufacturing are burned off from the heat of braking. Braking performance will improve after the burn in period."


https://www.parktool.com/blog/repair...and-adjustment