disc brake turning......

with the car jacked up and front wheels off, just how much drag should there be when you try to turn the rotors by hand by grasping the wheel studs and turn the rotor? thanks

Not much at all. The brake pads should be just kissing the rotor, allowing it turn fairly free. If you try to spin the rotor, I would not expect to get a full revolution after you release it.

That sounds right. Not much drag should be present.

Not much at all. The brake pads should be just kissing the rotor, allowing it turn fairly free. If you try to spin the rotor, I would not expect to get a full revolution after you release it.

Agreed.. there should be about .050 max total clearance between the pads and rotors... there should be absolutely no brake pad drag.(Ideal). but a rub here and there is normal.. the Master cylinder keeps no pressure on the calipers at all. the caliper is a floating type as are the pads to a degree so there may be some contact but no pressure.

Rear drums are different.. the master cylinder keeps a 10psi pressure on the rear drum line at all times... if you had front drums (which you dont) there would be 10psi on them as well. A certain amount of drag on drum brakes is necessary for proper function.

thanks......i will have to check the clearance for the pads, and if it is the piston not releasing? new caliper?