Overcenter spring rubbing

You either have a worn bearing/bushing in the pedal pivot shaft assembly of there is something misaligned in the clutch linkage driving the pedal over. For whatever reason the a body pedals are not nearly as beefy as the b body stull and folds easily.

Carefully check alignment of the clutch linkage below while a helper activated the pedal.

(with the wheels blocked if you are on an uneven surface lol)