A brake disc, for a vehicle, comprises a cast iron rotor 10 rotatable about an axis X-X and including an axially extending tubular flange. A sheet steel hub 20 includes an axially extending tubular portion 24 of diameter slightly greater than that of the rotor flange so that it fits over it. Rivets 30 hold the hub 20 and the rotor 10 together by pressing the tubular portion 24 of the hub 20 into tight engagement with the rotor flange at circumferentially spaced fastening points. Between the fastening points there is radial clearance between the rotor flange and the tubular portion 24 of the hub 20. The use of sheet steel for the hub reduces the weight of the disk. The difference in diameters between the rotor flange and the tubular portion of the hub facilitates assembly. The radial clearance reduces stress in use of the brake. The configuration may be modified to locate the tubular portion 24 of the hub 20 within the rotor flange.
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