[QUOTE= Put a dual pivot front brake on all my old bikes. Save all of the parts I've pulled in a box.[/QUOTE]

Why on the front and not the back?

Right now i hvae 2 bikes with brakes that I find weak in terms of stopping power for unknown reasons. (I started a thread on it called weak Diacompe brakes) .
One is a 1987 Schwinn Voyageur touring bike with Diacompe center pull. The other is a 1982 Trek311 with Diacompe sidepull. On person advised to take the brakes apart, clean, regrease the pivot and put back togheter. Another person said new dual pivot brakes are much better.
(The current brakes were already adjusted, cables checked, brake pads replaced on the Trek, by a good mechanic.)

I think rear brake stopping power is more critical than front (no fun going over the handlebars on a short stop using only front) so wondering why you only replace the front brakes?