What does a release bearing do? I brought my Nissan Escapade to the casa for pms and they told me they heard something and it's time to replace the release bearing. The catch is they want to replace the whole clutch assembly kit with the release bearing. Can I just replace the release bearing and not the whole clutch assembly (they estimated the clutch assembly kit at 20k)? Minor repair lang ba ang replacement ng release bearing? How do I really know the release bearing has to be replaced ( dahil sabi lang nila may narinig sila which is not a good enough reason for me)?

Thank you, workshop gurus, for your expected inputs.