Need to get this off my chest.
Sent my Airware for servicing at Mova Automation last Tuesday. The mechanic told me that I need to change my brake pads and so I did. After the brake pads were changed I noticed a knocking sound whenever I stepped on the brake. I brought the car back to Mova on Wednesday and they told me that my rotary disc is damaged and needed $400+ to replace it. I didn't want to spend the money so they offered to "do me a favour by polishing (or something) the rotary disc" for $100 but no guarantee it will work. True enough, one day after the servicing the noise came back again.
I suspect they damage my rotary disc when they were changing the brake pads but I have neither the evidence or skill to prove that. Just felt cheaper and guess I won't be going to Mova to service my car anymore.