 Additional, largely cosmetic changes included a new grill, headlights, bonnet and rear panel and taillights.A brake proportioning valve was fitted to all Centuras from factory to compensate for weight transfer during braking.When the car "nose-dived" under heavy braking, a mechanical link connected to the proportioning valve reduced the brake pressure on the rear wheels, to prevent them from locking up and causing the back of the car to slide around.