| 摘要 |
A brake applying device for an internal cylinder having pistons operated to apply the brakes by one or both of hydraulic pressure or a wedge assembly that move transversely of the wheel cylinder. The wedge assembly has a wedge and rollers which act between the wedge and the pistons to facilitate movement of the wedge. The rollers are housed in a cage that can move relative to the wedge, the unloaded datum position of the cage on the wedge is determined by two opposed springs that act on the cage. In order to prevent the cage from becoming damaged during exceptional service conditions it has been arranged for the cage to move relative to the wedge during the initial application of the brakes. This is achieved by providing an abutment which is encountered by the cage during retraction of the wedge so as to compress one of said springs.
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