Originally Posted by
Durooo
That's the big issue with me. The brake was Very soft. He even said he saw it drip fluid, so yes, it was leaking. Even if he found the coupling and tightened, he did NOT attempt to bleed the brake. He simply unscrewed the top screw, and attempted to "top it off".
That
might be good enough, if there are no trapped air bubbles. The main thing is you have to be 100% sure he fixed the leak. If he fixed the leak, and topped it off, and the lever feels firm, then you are probably ok. However, if any mineral oil (or DOT fluid) got on the brake pads, they are ruined and a safety hazard, because they won't work.
They have to be replaced, at the shop's expense, and while you are at it, make sure they aren't rubbing the disk and are absolutely silent. DOT fluid is corrosive to bike finish and highly toxic, by the way. Mineral oil is harmless. Usually the mineral oil has a little bit of red dye in it. I'm not sure about the DOT fluid because (as a chemist) I stay as far away from it as possible.