A lot of parts get stuck or froze together on vehicles that sit unused for long periods of time (In areas that are damp, this stuff can happen in less then a year), brakes are among the worst offenders, but I've seen cases of nearly everything automotive stuck together with other parts that sit against them.

Most old cars found that have been sitting for years have locked up drum brakes. I've seen brake shoe stick to the drums, and brake shoes stick to the backing plates. Often wheel cylinders and e brake cables are stuck/frozen tight. I've even had removable brake drums stuck on rear axle flanges bad enough the drum had to be cut off the axle. Gene