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A sliding desk accessory support for mounting on an underside of the desk to provide a conveniently positionable retractable support for frequently used items. The sliding desk accessory support includes a support for supporting an accessory. The support has a support surface for resting the accesso

A sliding desk accessory support for mounting on an underside of the desk to provide a conveniently positionable retractable support for frequently used items. The sliding desk accessory support includes a support for supporting an accessory. The support has a support surface for resting the accessory thereon. A slider is provided for mounting the support on the underside of a desk in a manner permitting substantially linear movement of the support with respect to the desk. The slider is positioned between the support surface of the support and the underside of the desk when the slider is mounted on the desk for minimizing the lateral extent of the invention when installed.

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A sliding desk accessory support for mounting on an underside of the desk to provide a conveniently positionable retractable support for frequently used items. The sliding desk accessory support includes a support for supporting an accessory. The support has a support surface for resting the accesso

A sliding desk accessory support for mounting on an underside of the desk to provide a conveniently positionable retractable support for frequently used items. The sliding desk accessory support includes a support for supporting an accessory. The support has a support surface for resting the accessory thereon. A slider is provided for mounting the support on the underside of a desk in a manner permitting substantially linear movement of the support with respect to the desk. The slider is positioned between the support surface of the support and the underside of the desk when the slider is mounted on the desk for minimizing the lateral extent of the invention when installed. e system including a master cylinder supplying fluid to wheel brake cylinders, the apparatus comprising: a control unit for controlling operation of the hydraulic pressure control apparatus; a pressurized fluid generating unit for pressurizing brake fluid and supplying the pressurized fluid; and a hydraulic pressure distributing unit for mechanically selecting and transmitting at least one of hydraulic pressure of the pressurized fluid supplied from the pressurized fluid generating unit and hydraulic pressure supplied from the master cylinder of the brake system to the wheel brake cylinders of the brake system wherein the pressurized fluid generating unit comprises: a pressurized fluid generator for pressurizing fluid supplied from the master cylinder under control of the control unit; and a hydraulic-input control valve unit for controlling supply of the pressurized fluid of the pressurized fluid generator to the hydraulic pressure distributing unit through a hydraulic input line. 4. The hydraulic pressure control apparatus of claim 3 wherein the pressurized fluid generator comprises a motor driven by control of the control unit and a hydraulic pump driven by the motor. 5. The hydraulic pressure control apparatus of claim 3 wherein the pressurized fluid generating unit further comprises an accumulator for accumulating the pressurized fluid supplied from the pressurized fluid generator. 6. The hydraulic pressure control apparatus of claim 3 wherein the pressurized fluid generating unit further comprises: a first pressure detector for detecting hydraulic pressure of the pressurized fluid supplied from the pressurized fluid generator to the hydraulic-input control valve unit; and a second pressure detector for detecting hydraulic pressure of the pressurized fluid supplied from the hydraulic-input control valve unit to the hydraulic pressure distributing unit. 7. The hydraulic pressure control apparatus of claim 3 wherein the hydraulic-input control valve unit comprises a first hydraulic-input control valve and a second hydraulic-input control valve, the first hydraulic-input control valve being disposed to the hydraulic pressure distributing unit on the hydraulic input line, the hydraulic input line communicating the pressurized fluid generator and the hydraulic pressure distributing unit, and the second hydraulic-input control valve being disposed to the pressurized fluid generator on the hydraulic input line. 8. The hydraulic pressure control apparatus of claim 7 wherein the first hydraulic-input control valve is normally open and the second hydraulic-input control valve is normally closed. 9. The hydraulic pressure control apparatus of claim 3 wherein the pressurized fluid generating unit further comprises a hydraulic exhaust control valve for controlling exhaust of brake fluid from the hydraulic input line. 10. The hydraulic pressure control apparatus of claim 9 wherein the hydraulic exhaust control valve is normally opened. 11. A brake system, comprising: a master cylinder actuated in response to driver manipulation of a brake pedal; a plurality of wheel cylinders communicating with the master cylinder; a hydraulic pressure generating unit separate from said master cylinder; a control unit communicating with said generating unit to signal the generating unit to generate hydraulic pressure; and a distributing unit communicating with the master cylinder, the hydraulic pressure generating unit and said wheel cylinders, said wheel cylinders communicating with the master cylinder through the distributing unit, wherein the distributing unit selectively provides hydraulic pressure to the wheel cylinders from one or both of the master cylinder and hydraulic pressure generating unit in response to user manipulation of the brake pedal and signals from the control unit, wherein said distributing unit comprises: a body defining a cavity; at least one piston member disposed in said cavity to define a cent ral pressure chamber at one side of the piston member and a distributing chamber at an opposite side of said piston member, wherein the hydraulic pressure generating unit communicates with the pressure chamber to provide pressurized hydraulic fluid thereto and the master cylinder communicates with the wheel cylinders through said distributing chamber; and an elastic member disposed in said distributing chamber acting on said piston member in opposition to hydraulic pressure in said pressure chamber supplied by said generating unit, whereby hydraulic pressure to the wheel cylinders from said distributing chamber may be varied by changing pressure in the pressure chamber with said generating unit, wherein: said at least one piston member defines an internal space through which the master cylinder communicates with the distributing chamber; a check valve is disposed between said internal space and distributing chamber to control hydraulic fluid flow there between in response to the piston member position in said distributing chamber; and said distributing unit includes first and second piston members, distributing chambers and check valves disposed symmetrically around the central pressure chamber. 12. A brake system, comprising: a master cylinder actuated in response to driver manipulation of a brake pedal; a plurality of wheel cylinders communicating with the master cylinder; a hydraulic pressure generating unit separate from said master cylinder; a control unit communicating with said generating unit to signal the generating unit to generate hydraulic pressure; and a distributing unit communicating with the master cylinder, the hydraulic pressure generating unit and said wheel cylinders, said wheel cylinders communicating with the master cylinder through the distributing unit, wherein the distributing unit selectively provides hydraulic pressure to the wheel cylinders from one or both of the master cylinder and hydraulic pressure generating unit in response to user manipulation of the brake pedal and signals from the control unit, wherein said pressure generating unit comprises: a hydraulic pump with an inlet and an outlet, a first fluid line from said outlet communicating with said distributing unit; at least one supply control valve disposed in said first fluid line to control fluid flow from said pump to said distributing unit; a second fluid line communicating between the distributing unit, the pump inlet and a fluid reservoir associated with the master cylinder; and at least one exhaust control valve disposed in said second fluid line to control fluid flow from said distributing unit. 13. The brake system according to claim 12, wherein said second fluid line comprises: a fluid exhaust line communicating with said first fluid line between said at least one supply control valve and the distributing unit; and a pump supply line communicating between said exhaust line and said pump inlet, wherein said at least one exhaust control valve is disposed in said fluid exhaust line between the first fluid line and the pump supply line. 14. The brake system according to claim 12, wherein two fluid control valves are disposed in the first fluid line between said pump and distributing unit. 15. A distributing unit for a brake system, wherein the distributing unit communicates with a master cylinder, a hydraulic pressure generating unit and plural wheel cylinders, said distributing unit comprising: a body defining a cavity; first and second piston members disposed in said cavity to define a central pressure chamber there between and distributing chambers at an opposite side of each said piston member, each piston member defining an internal space; an elastic member disposed in each said distributing chamber acting on said piston members in opposition to hydraulic pressure in said central pressure chamber, whereby hydraulic pressure from said distributing chambers may be varied by changing pressure in t