For when your caliper brakes NEED cleaning, you can disassemble. It's kind of a fun mechanical experience anyway, depending on the complexity of the brake.
Many caliper brakes just have bushings and washers at the pivots.
Dual-pivot brakes have more things to keep track of.
Nicer brakes may have bearing units at one or both pivots, and these can be very tricky to keep track of and keep the tiny bearings in their sleeve or cage.
I overhauled some early 90's Shimano 600 (predecessor to Ultegra) dual-pivot brakes once, and I think I counted something like 60+ separate pieces. 40+ if you don't count each bearing as a separate part.
