Compressing the pistons back into the calipers is what you want to do ... but do not leverage against the brake disk.
What I do is to use channel lock pliers an compress the edge of the brake pad and the outside of the caliper.
>>>Do one at time <<< to avoid the other side popping out.
Keep us posted,
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)