The pads should be in light contact with the rotor at all times, just no pressure squeezing the rotor, this prevents pads(or rotor) from cracking if suddenly heated by applying the brakes.
Wheel should spinning freely but pads should drag enough to slow them down after a full turn or two when wheel is off the ground.
There should be no drag if coasting.
Rear shoes also drag just not as much, they are in an enclosed housing so stay warm and when brakes are applied the temp increase isn't as steep since rear brakes have a lighter load.
Some pads do have springs, toyota camry has a pair in each wheel, scissor springs, that hold pads open, they are there because the caliper designed cause squealing noise without them, pads still rub a bit through, just not enough to cause the squeal, lol.
Last edited by RonD; 08-07-2015 at 11:52 AM.