return spring
/ɹɪtˈɜːn ˈspɹɪŋ/
n
English · return spring中文 · 复位弹簧Español · resorte de retornoFrançais · ressort de rappelDeutsch · Rückholfeder
意味：Spring returning the brake shoe to its initial position once the pressure on the brake pedal has ceased.