<p>An anti-locking modulator for reducing braking pressure applied to brakes during anti-locking operation dependent upon pressure in a pressure chamber. An input solenoid valve supplies pressurized fluid to the control chamber and is weakly biased to be closed so that a reduction of pressure in the pressure chamber opens the input solenoid valve for repressurization. Electrical activation of the input solenoid positively closes the input solenoid valve. An output solenoid connecting the pressure chamber to near atmospheric pressure valve is biased against the chamber pressure to be closed to thereby prevent overpressurization. Electrical activation of the output solenoid opens the output solenoid valve, thereby depressurizing the pressure chamber.</p>
