Possible Clues:

• Put your foot down here when you want to stop
• Lad fighting with barkeep: could this make him stop?
• Slowing lever on a car floor
• Bus-stop need?
• It will slow you down
• Accelerator's neighbor
• Auto's lever for slowing
• It may bring you to a screeching halt
• It checks your speed
• I'm depressive and getting slower