| 摘要 |
In a pressure modulator for an anti-lock vehicle wheel braking system, responsive to a change of volume of a modulation chamber, caused by a flange of a first central piston element cooperating with a piston step of a second piston element. The piston elements are located in a bore step of the pressure modulator housing which has a diameter which is larger than that of the modulation chamber. The two piston elements each have a displaceable piston flange for forming two sides of a control-pressure space, subject to outlet pressure of an auxiliary-pressure source, which causes the piston elements to be forces, counter to a pre-stress of a modulator spring engaging thereon, into a position which corresponds to a minimum volume of the modulation chamber and when subject to a valve-controlled relief of pressure in the control-pressure space, the piston elements assume the position corresponding to a maximum volume of the modulation chamber.
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