Distribution system for selectively controlling and supplying brake pressure to wheels

An apparatus for controlling wheel brake pressures in a plurality of wheels comprising

• brake pressure generating means (2,5) operated by a driver for generating a pressure which responds to a magnitude of operation by the driver;
• a source of constant pressure (21, 22) for producing a substantially constant high pressure;
• selection means (64, 65, 61-63) for each wheel for selecting one of the pressure corresponding to the magnitude of operation and the high pressure produced by the source;
• first intensifying/reducing means (312) for selectively supplying either pressure, selected by the selection means, or a low pressure to a front right wheel brake (51);
• second intensifying/reducing means (334) for selectively supplying either pressure, selected by the selection means, or a low pressure to a front left wheel brake (52);
• third intensifying/reducing means (356) for selectively supplying either pressure, selected by the selection means, or a low pressure to a rear right wheel brake (53);
• and fourth intensifying/reducing means (378) for selectively supplying either pressure, selected by the selection means, or a low pressure to a rear left wheel brake (54).