| 摘要 |
In a disc brake for a heavy road vehicle there is provided a mechanically preloaded brake assembly which includes a brake housing, a median wall in the brake housing parallel to the disc which is also in the housing. The disc is mounted to the adapter sleeve of the wheel, and the housing is mounted to an annular ring mounted to an axle of the vehicle. A pressure plate is provided within the housing and located between the annular intermediate wall and the housing wall opposite from the disc and is parallel thereto. The brake lining ring including a backing plate is provided adjacent a radial friction surface of the disc, and push rods extend between the pressure plate and the backing plate of the brake lining ring. A spring extends between the housing wall and the pressure plate urging the pressure plate and the brake lining ring against the friction surface of the disc, and a pneumatic bladder is provided between the pressure plate and the annular inter- mediate wall in order to overcome the urging of the spring when pneumatic pressure is supplied within the bladder.
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