When I first tried composting a big pile of leaves, it just didn’t work. Then a lady gave me her leftover CM compost she felt was too raw for her garden. I brought it packed in garbage bags in my car trunk. The car stank for weeks! 
That little bit of CM did the trick. The pile started steaming in a week! So yes, it’s great for composting browns. I’m not sure you want all that Nitrogen for your fruit trees though.