1. Dhululubada biriiga, oo sidoo kale loo yaqaano master cylinder, waa usha shaqada ee baydalka ama qalabka biriiga. Waxay inta badan ka kooban tahay column gaaska, piston, gasket, haanta saliidda, qalabka socodka saliidda iyo wixii la mid ah.
2. Qaybaha ugu muhiimsan ee dhululubo waa madaxa dhululubada, madaxa dhululubo, dhululubo, biistoon, usha bistoonka, gacanta hagaha, xidhid iyo usha jiid.