NO EMGANCHA changes in Renault Megane

Waves very good to all my consultation is, that in my renault megane of the year 2000 it does not hook the changes, but for any lao, save my question is what it can be ?????????? Since before I luxurious there was no problem, nor small traces of which the Embbreague album was already spent as usually noticed, finding if you can help me, since I am a mechanic learning and good almost no one is almost very