Have you considered the possibility someone in the past replace the parking brake cable with the only one they could find, which happened to be the wrong length? Parking brake cables are pull (tension) cables rather than push-pull. Based on my experience undoing what other people have done to older vehicles, kinks in the cable indicates a wrong cable or installation issues.
I've been banging away at my sources and managed to find a listing for a B300 with a 145" wheelbase ... and it used the same front cable as all the other B300s. Some listings indicated different right and left rear parking brake cables for the school bus variant of B300s.
