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Drums or disks in the back?
The rears should spin freely longer than that. Here in the Rust Belt, parking brake cables corrode stuck especially if they aren't used daily. A hung-up parking brake cable could prevent full release of the shoes on rear drums, or the special parking brake shoes or pads on disk brake cars.
If the pedal isn't pulsating when you brake, the rotors are probably not warped.
Jack it up again, pull the wheels, inspect the rotors, pads, and if present drums and shoes. Scoring on the rotors and/or drums (if bad enough) indicates a need for resurfacing or replacing them. Thin/gone/unevenly worn pads/shoes should be replaced. Calipers should be free to slide back and forth on their guides. Flexy brake lines shouldn't be cracked, their brackets shouldn't have really heavy corrosion; hard brake lines shouldn't be badly rusted. If one goes that far they may as well pull the pistons outta the calipers for inspection of the bore, piston, and seals. Same with wheel cylinders in the rear for drum brakes.
It's usually a filthy job but someone's gotta do it.
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