INFECTIOUS AGENT. Viral pathogens are the most common cause of respiratory infection in travelers; causative agents include rhinovirus, respiratory syncytial virus, influenza virus, parainfluenza virus, human metapneumovirus, measles, mumps, adenovirus, and coronavirus.
Find a repair shop that will cut out the bad section of metal brake line and insert a new section. Some shops will want to replace the whole brake line, but that can be more expensive and not needed in many cases. You'll pay $300 or so depending on the location of the leak.
No decent repair shop will charge $500.00 just to change the brake pads. On the other hand, if the rotors need serious fixing (beyond the general buffing), that will cause a quote like that pop up. Last year, my brakes and rotors got so bad that I needed to replace them, and that cost about $400.