Keselowski posted on his Twitter page Wednesday that he hit the wall in a 155 mph corner when the brakes on his No. 2 Dodge failed during a test session.
Penske Racing said in a statement that Keselowski walked from the car and was taken to the hospital for precautionary reasons.
Keselowski posted on Twitter that he'll be fine to race this weekend at Pocono Raceway.
Keselowski is 21st in the standings and trying to earn one of the wild-card berths in the Chase for the Sprint Cup championship.