89 W126 560 SEC Vibration In Brake Pedal When Stopping

[xkeots]

Hi All,

I had a vibration in the brake pedal when stopping and I figured that like most cars vibration in pedal is rear rotor, vibration in steering wheel is front rotors.
The car had to go to Me/Be to get the lambda set so I asked them to check and they said rear rotors.
I changed the rear rotors and pads and I still have that vibration in the pedal. I decided to change the front pads a month after that even though they were still good so I had a time that all pads were done.
Do I need to get the rotors cut or can it be something else?

Thanks
Jack
1989 560 SEC
1980 450 SL