Abstract: An air lumbar support is provided for establishing a desired attitude of a driver's seat of a vehicle, and is associated with an attitude control system. A pad of a seat back is supported by a plurality of air bags, each of which is connected with a solenoid valve, which when open, permits the air to be discharged into the atmosphere from the air bag. When a desired attitude is to be established, air under pressure is fed to the air bags. Attitude establishing data is in the form of a number of times the solenoid valves are energized for opening for short intervals, and is stored in a non-volatile semiconductor read-write memory if the attitude is to be registered. In response to a key operation, a microprocessor reads registered data automatically, initially driving an air pump, followed by opening the solenoid valves a number of times indicated by the data, thus establishing a desired air pressure in the air bag.

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: A pressure differential switch device having a flexible diaphragm between two chambers subject to differential pressures and a permanent magnet movable with the diaphragm against a biasing force when pressure differences occur in the chambers; the magnet moving to a position in which the magnetic field of the magnet actuates the contacts of a reed switch assembly.

Abstract: A hydraulic brake system for an automobile comprises an automatic brake valve disposed in a fluid passage between a pump and a reservoir. The automatic brake valve is actuated by an obstacle-sensing computer to increase the fluid pressure in the fluid passage irrespective of foot brake pedal depression. Therefore, the brake may be applied even when the automobile driver should be unaware of an obstacle on the road.