Brake Question

[Mercedes Guy]

Last weekend I tried to replace the rear brake pads on my 1992 190E 2.3 but the pins that hold the pads in won’t budge. They have some rust on them and I think that’s the problem. Normally in a situation like this I would spray WD-40 on the parts and try to break them free but I was very reluctant to do that because I didn’t want to get any on the pads or rotors. I replaced the front pads in November and it was a piece of cake. The rear brakes have proven to be much more difficult. What would you do in a situation like this? Thanks!