The Italian rider fell onto his right wrist and arm. Brambilla underwent immediate X-rays to his wrist after the finish, and results seem to exclude any fracture.
He expects to be back in action for the fifth stage on Wednesday. "I was riding in the peloton when suddenly somebody in front of me hit their brakes," Brambilla said.
"I had to brake also, but somebody touched my bike from behind and I fell. Fortunately the speed wasn't so high.
“I had a few scratches and pain on my right wrist, but that's ok. It wouldn't be anything serious. Tomorrow I will be at the start."