that seems super high to me, but it really depends if/what all is needed. usually its just the rubber brake hose that is replaced. little ones might be $20-$50. longer ones that go front to back i could see being more, so a $300 job with labor sounds about right.

cars also have the hard lines. these are the skinny (like straws thin) metal pipes. these are way more durable, so rarely need replaced, but would be a lot more expensive if they do. if they are rusted/corroded to where they are a safety issue, it would be critical to replace them asap.

the only way to know the state of it is get your own eyes on it and/or get a second opinion. typically, i always decline these kind of recommended services. im not going to be put on the spot or pressured. i tell em finish the work we agreed on, we’ll settle up, and ill get the vehicle back and look into it.

have another shop look at it. dont tell em shit. do not say, “this other shop said said i needed $3000 of brakes. do i need $3000 of brakes?” because a dishonest shop will see dollar signs and they’ll know in their head they’ll call you and ‘confirm’ you need it before they even look at it. just say, “im gonna lend the vehicle to my niece for a road trip, can you just do a oil change and check it over? i wanna make sure its safe”. if they independently discover the brakes need major work on their own without a tip-off, its probably legit.