Abstract: An anti-skid brake control device includes a servo mechanism for controlling pressure reducing operation of the device. The servo mechanism includes a constant pressure chamber connected to an engine intake manifold, a variable pressure chamber alternately connected to atmospheric pressure and vacuum in the engine intake manifold, and a vacuum pressure responsive valve including a flow restriction passage wherein, when the engine vacuum rises above a predetermined level due to engine brake operation, the restriction passage is actuated to restrict the vacuum flow to the variable pressure chamber to gradually carry out the pressure recovering operation of the anti-skid brake applied with the engine brake operation.

Abstract: An anti-skid brake control apparatus is disclosed as including a fluid pressure cut-off valve for opening and closing a fluid circuit between a master cylinder and wheel cylinders in response to a skid sensing signal. The pressure cut-off valve may also utilize a first and second pressure sensing valve arranged in a row, with an acceleration responsive valve and the first pressure sensing valve being arranged in a series.

Abstract: An anti-skid brake control system comprises a cylinder casing having a first chamber connected with a master cylinder and a second chamber in communication with wheel brake cylinders, a cut-off valve disposed within the first chamber for selectively interrupting fluid communication between the first and second chambers, and a hydraulic capacity controller including a plunger axially reciprocable within the first chamber and operatively engaged at its both ends with the cut-off valve and a piston reciprocable within a vacuum servo-motor, the plunger being retracted by the piston to activate the cut-off valve and thereafter to increase the capacity of the second chamber to decrease the braking pressure applied to the wheel brake cylinders.

Abstract: An anti-skid brake control assembly for controlling brake pressure which is first quickly reduced when a skid condition occurs or is about to occur and in which the reduced brake pressure is restored to resume the braking operation. During restoration of the braking pressure, the pressure is first rapidly increased and then more gradually increased thus preventing a skid condition from being repeated rapidly.

Abstract: A vehicle brake system with anti-skid control apparatus including a master cylinder, a brake pedal operatively connected with the master cylinder and a wheel brake actuated by the fluid pressure from the master cylinder which includes a cut-off valve disposed between the master cylinder and the wheel brake for controlling communication between the master cylinder and the wheel brake, the fluid capacity of the fluid pressure circuit between the wheel brake and the cut-off valve capable of being increased or decreased, a valve for controlling the cut-off valve and for increasing or decreasing the capacity of the fluid pressure circuit according to the skid condition of the wheel and for selectively changing the speed of changing the capacity of the fluid pressure circuit at two steps in the capacity-decreasing direction, the system being characterized by a signal for controlling the increase or decrease of the fluid pressure circuit at high speed in the capacity-decreasing direction by the cut-off valve for a c