I just replaced the old rear drum brakes on my 1966 Mustang with a new set of SSBC disc brakes. The front brakes were swapped from drum to disc about a decade ago. While I was at it this weekend, I put in a new dual bowl master cylinder & power booster combination as well as a new distribution block (for 'all disc' configuration). All the brake lines are new from front to back all the way to the caliper at each wheel. There are no brake fluid leaks anywhere on the system. The emergency brake is correctly installed out to each rear caliper mechanical mechanism.
Having shared all of the above, after completing the rear disc brake installation and bleeding the lines, I placed the tires on the car to take her out for a spin. Once around the block and I'm smelling burning brake pads. I wheel back in the garage, get her rear end up on jack stands, remove the wheels and I see that the rotors will not spin freely. I remove the calipers, get the pistons screwed back down into the caliper housings and bolt them back in place over the rotors....Rotors now spin freely. While the car is still up on jack stands, I get in and depress the brake pedal up and down a few times. When I get out and try to spin the rear rotors, they are locked up tight and won't budge. The brake pistons have pushed out against the brake pads when I depressed the brake pedal a few times, but once the brake pedal has been released, I would expect the pistons to retract a bit so that the rotors can spin freely and aren't dragging (and definitely not frozen because of the pistons not retracting at all!).
Appreciate any and all tips/ guidance on what I'm missing here. Thanks!
Having shared all of the above, after completing the rear disc brake installation and bleeding the lines, I placed the tires on the car to take her out for a spin. Once around the block and I'm smelling burning brake pads. I wheel back in the garage, get her rear end up on jack stands, remove the wheels and I see that the rotors will not spin freely. I remove the calipers, get the pistons screwed back down into the caliper housings and bolt them back in place over the rotors....Rotors now spin freely. While the car is still up on jack stands, I get in and depress the brake pedal up and down a few times. When I get out and try to spin the rear rotors, they are locked up tight and won't budge. The brake pistons have pushed out against the brake pads when I depressed the brake pedal a few times, but once the brake pedal has been released, I would expect the pistons to retract a bit so that the rotors can spin freely and aren't dragging (and definitely not frozen because of the pistons not retracting at all!).
Appreciate any and all tips/ guidance on what I'm missing here. Thanks!