Ivalve yesango ibhekisa kwivalve yolawulo esona siqwenga sokuvala (isango) sihamba kwicala elithe nkqo ecaleni kombindi wepaseji.Kwimibhobho, umlawuli we-brake angasetyenziselwa kuphela ukuvulwa ngokupheleleyo kunye nokuvalwa ngokupheleleyo, kwaye akanakusetyenziselwa ukulawulwa kunye ne-throttling.