An auxiliary mechanism for an auto brake system, the mechanism includes a power cylinder, the interior of the power cylinder has a power piston and drive unit for pushing-up the power piston. A rectangular case body is joined to the rear end of the power cylinder and its interior has a rotational cam unit. An inductive unit including several on/off switches that are located on the power cylinder and a power box for driving said cam unit are provided. When oil pressure is transmitted into the power cylinder, the inductive unit will conduct the circuit and drive the cam unit to rotate for pushing-up the drive unit permitting the power piston to provide a boosting and pressure retaining function for each brake branch pump in order to achieve effective braking.

An anti-lock braking control device includes a housing which defines cylindrical first chamber, two second chambers and a third chamber. The housing has two which are inlet ports connected to two master cylinders and two outlets ports which are connected to rear and front brakes. The third chamber is communicated with the inlet ports and is connected to two second chambers by two oil passages. The second chambers are aligned with one another and are connected to the first chamber. A rotor shaft with a driving disk is mounted rotatably in the first chamber. An oil regulator assembly is mounted in the third chamber for controlling the flow rate of hydraulic oil from the master cylinders to the second chambers. Each of a pair of reciprocating pump assemblies has a rod member which is driven by the driving disk to move reciprocally in a respective one of the second chambers. One end of the rod member extends into an oil chamber which is communicated with a respective one of the oil passages and one of the outlet ports in order to produce pressure waves to the rear and front brakes when the rotor shaft is driven by a power-driven motor. A pressure switch unit is connected to one of the second chambers and the motor in order to actuate the motor when the oil pressure is larger than a predetermined value.

An automatic wheel lock-up control apparatus alternately and cyclically applies brake-pedal controlled pressure to the primary and secondary brake lines driving the slave cylinders of a vehicle's wheel brakes when the brake-pedal pressure exceeds a predetermined value. The apparatus includes an elongated cylindrical body having identical halves, one containing a primary valve for removing or applying primary master cylinder pressure to the primary brakes, and the other containing an identical secondary valve for removing or applying secondary master cylinder pressure to the secondary brakes. An eccentric rotated by an electric motor reciprocally drives a pushrod longitudinally within the body of the apparatus to operate the primary and secondary valves in an alternate, push-pull fashion. The motor is energized by a battery connected in series with a separate pressure switch on the inlet sides of both primary and secondary valves, initiating operation of the apparatus when the pressure in either master cylinder inlet exceeds a predetermined threshold.

Apparatus with a force- or moment-generating actuating member, operating electromagnetically or electromotively and a mechanical transmission arrangement, rotating of sliding, working on an actuation arrangement of a friction clutch or brake, characterized by a drive or control arrangement which excites a pulsating force or a pulsating moment on the mechanical transmission arrangement member.

An hydraulic anti-skid braking device to produce pulsating or "on and off" operation (intermittent control) of a pair of brakes connected to the front and rear brakes of a motor vehicle. The device includes a pair of pistons each piston including a completely radially extending through-passage, and off-set and bleed portions.