The backs of caliper have a 'lid' that you flip up and then undo the top and bottom bolts of the outer back shell. That lifts off and exposes the back of pads.
Use a screw driver to wedge the back ends of pads and force the piston down to get the pads loose.
pull out pads, clean areas,apply lots of brake pad paste to stop squeaks.
reassemble.
make sure rotors are OK. those are harder to replace.

do an archive search buddy.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD