Originally Posted by 97 SL320

Get the Brembos ( or other high quality non boutique rotors ) $ 51 each isn't bad and what I'd expect to pay for quality. Brembo is a OE supplier to some auto makers.

Many times low price rotors are not balanced, use metal the rusts badly and , if vented , sometimes have massive core shift. Core shift is where the vent holes are not centered between the two sides of the rotor. This unevenness leads to early warpage of rotors and sometimes a tire balance problem that won't go away no mater how many times the tires are balanced.

On cars with unitized hub / rotors ( mostly rear drive American cars / trucks ) I will not install low cost ( China ) rotors because the hub can break out.

As for old pads on new rotors, as long as the friction material is flat and square to the backing they are OK to reuse.

All of that said, I was able to score someone's last 4 piece set of new in box Brembos to fit my SL for $ 80 including shipping.