Freeing/loosing tires/rims?

[kmac]

I have the metal tires/drums on my car with the plastic rim covers. I took off the plastic covers but cannot seem to get the two back drums free ive tried everything even liquid wrench. The front two came off fine. Any ideas or tips. I need help!

 

[SteveO]

There is a small slot on the inside of the drums. You have to take a flat screw driver and loosen the pads from the drums. There is a small gear looking thing that turns to adjust the pads. Easy fix.