Car runs fine without wheels but bounces with wheels

Hi Guys,
I made a car in 3dsmax with the bone structure.
I also made a wheel in another 3dsmax document.
In UE 4.12 I connected the wheel to the 4 bones of the wheels by making 4 sockets.
Without the mesh of the wheels the car drives fine and the size of the car considers the space of the bones.
When I add the wheels the car bounces like those californian pimped cars and flips almost immediately.
Please help, I don’t have a clue!

Thanks you all!

Most likely you have collision between the car and the wheels causing the bping. You have to seperate them somehow or remove the collision of the wheels.