coo

Hi there, I discovered that both my sealings on my rear axle are leaking and now my brakes are soaked with differential fluid. My garage is telling me that I have to get the seals replaced( which makes sense of course) but they tell me that I also have to replace my brake shoes for the emergency brake, brake pads and that there will be more parts that have to be replaced and that the total cost will be around $1500 and $2000. Just a year ago I replaced all brakes completely!? Is this thru, that the differential fluid ruins the brakes completely and that all this has to be replaced, while everything is still almost new? I tried to find some more information about this online, but couldn't find really answers to my questions. So I hope that here maybe someone can give me a bit of advice if I really have to send all this money (again!) Thanks Marco