Need help diagnosing brake problem - Mustang pulls hard to right when stopping, had it out the other day and brakes became "very stiff" like stepping on a brick - Drove home, took wheels off, no leaks, everything looks okay, possible problems?

? Drum brakes, all new a couple of years ago, car is only driven occasionally in summer months, probably less than 500 miles on new brakes. Buddies...
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