My ds 2 is a BIG fan of diggers and tractors. I have yet to find a tractor book which portrays a female driving! (I think there is a Maisey one and ds has asked for it, but I think it was a colouring book and I can't seem to find it).
Anyway, I have found one or two books, which he loves, that have a more balanced view of men and women's roles, or challenge stereotypes outright.
Toad Makes a Road - I was surprised t o find Toad was a strong minded independent female (complete with bulldozer, tarmac layer, line painter) who needs a road so makes it herself.
The Paper Bag Princess - has the prince being captured by the dragon and the princess rescuing him.
My Big Book of Rescue Heros - a bit of an older book, but pictures are lovely and it has men and women depicted in all the major services - firefighters/ambulance/police/coast guard.
So what else is out there?