Q: Brake pedal won't come back up once pushed down

Do you have a Ford hydro-boost system? If so, faults in that system can cause no or poor pedal return; to resolve the issue with a hydro-boost type system, please refer to the detailed diagnostic decision tree in the factory service manual; it is too lengthy to reproduce here. If you have a vacuum operated system, the causes of no pedal return are incorrect or missing return springs (including in the master cylinder or booster assembly), binding pedal linkages (bushings, etc.) and possibly a maladjusted master cylinder to booster push rod. To have the cause pinpointed, you can request an on-site visit from a certified mechanic. The relevant service to request is a brake pedal height/return inspection.