The rear brakes are ventilated rotors with four piston calipers. Brakes were ventilated front discs and rear drums. Front brakes have large diameter 12.6-inch ventilated discs. Rear diameter ventilated discs, no vacuum servo. The brakes consist of radially ventilated discs front and rear. B6 S4 brakes consisted of radially ventilated disc brakes front and rear. Enclosed racks may also be ventilated or temperature controlled to some degree. The calipers are coupled with 400x38mm ventilated and drilled discs. The brakes are ventilated carbon-ceramic discs. The air was ventilated through the building by large central ducts. The brake system consists of radially ventilated discs all round. All three brake disks on the GL1100A were internally ventilated. The rooms are properly ventilated and well lit. Being heavier than air, it tends to accumulate at the bottom of poorly ventilated spaces. While the harmful vapors are eliminated, the CO must be ventilated.