I've used a very wide C-clamp to collapse the pistons on the brake calipers for the Ram Van. It takes a loong time and many spins to achieve this feat.

Well, I got to do this again shortly. The pads are next to nothing after two years.

I found this recently. Take a caulking gun and chop off the tube carrier part. Now you have a less than 10-second and easy tool to compress the pistons!

See the blog posting here with photos!
http://www.garagejournal.com/forum/showthread.php?p=3338973

This is soooo clever!

 

That's just doggone clever !

 

coolio

 

this is what I use