I have just attempted first time,to replace new front disk pads on 89'560SL. The first pad I removed (A) was worn down to almost touching the sensor. Now here's the odd thing....the inside pad (B) was only 40% worn down?? when I attempted to insert a new pad into (A) I could not get it into place....the pistons would not withdraw enough (no how). The inside... (B) was no problem. So what I had to do was place the 40% worn one back into (A) and the new pad into (B) Could anyone explain why they did not wear down evenly in the first place ? and what could be the problem with the piston not fully withdrawing?
I checked all the other brakes and the pads were all showing about 40 % worn.
So I just had the one worn pad. Your thoughts or experiences would be greatly appreciated.

__________________
Share your knowledge. It's a way to achieve immortality.
Dalai Lama.