unbraked

/ʌnˈbreɪkt/
adjective
  1. Not equipped with or not using a brake; having no brake applied.
    • An unbraked trailer can be dangerous on steep roads.
    • He rode an unbraked bicycle, relying only on his feet to stop.
    • The unbraked cart rolled freely down the slope.
verb
  1. Past tense and past participle of unbrake.
    • He unbraked the wagon just before it hit the wall.
    • They unbraked the machine and it started moving.
    • She unbraked the car and pulled out of the driveway.