Leaking Valve Cover Gaskets

That’s what I was thinking- I don’t know much about cars mechanically but I can feel the brakes going, not to mention I have had the car for about 60k miles without them ever being replaced (bought it with 35k on it). They tried to tell me the brakes were ok at first and then only after I began questioning the leaks over the phone did they “re-test” my car and decide that the front pads and rotors probably should be replaced too. Is $500 for new pads and rotors reasonable or should I do that repair elsewhere as well? Thanks for the help!