I have a Sl Class w129 but since 2 year ago i began to have problems with the brakes and sometimes i try to push the brake pedal all the way but it was difficult to stop the car so i send it to a mercedes dealer but the mechanic can't fix the problem with the car and they damage the brake discs and the pads, so i decided recently to try with another mechanic and i have to buy new discs and pads, I buy ventilated discs for the 4 wheels and Ceramic pads (Akebono) but this didn't fix the problem, I have another mercedes S600 i did the same buying new discs and pads and this car stop like hell, but my SL Still have the same problems it needs a long distance to stop and you have to push all the pedal to stop the car, and the pedal feels too soft not like the other that stops only with a touch of the pedal. Do i have problems with other part of the brake system?