Brake holder

A brake control apparatus for an automobile having a brake fluid pressure generating source actuatable by a driver, at least two wheels with wheel cylinder, and at least two brake fluid pressure systems, one of said systems being connected between said brake fluid generating source and one of said wheel cylinders of the wheels, and another of said systems being connected between said brake fluid generating source and another of said wheel cylinders of the wheels;

• said brake control apparatus, in one of said brake fluid pressure systems, comprising:
• (A) a first ma:n body having a first bore, a first chamber, a first inlet communicating with said first bore, and a first outlet communicating with said first chamber, said first inlet being connected to said brake fluid pressure generating source, said first outlet being connected to one of said wheel cylinders, and said first bore, first chamber, first inlet and first outlet defining a brake fluid passage between said brake fluid pressure generating source and said one of the wheel cylinders;
• (B) a movable valve member arranged in said first chamber, and moved by its weight when the automobile is facing upwardly on an inclined roadway;
• (C) valve means arranged in said first bore, and engageable with said movable valve member to check brake fluid flow between said brake fluid pressure generating source and said one of the wheel cylinders;
• and
• (D) displacing means for displacing said movable valve member in response to stop operation of said automobile for opening and closing said valve means when said automobile is facing upwardly on said inclined roadway;
• and said brake control apparatus, in another of said brake fluid pressure system, comprising:
• (E) A second main body having a second bore, a second inlet connected to said brake fluid generating source, and a second outlet connected to another of said wheel cylinders;
• (F) a valve control piston slidably fitted to said second bore to form second and third chambers at both ends in said second main body, said second chamber communicating with said first chamber of said first main body, and said third chamber communicating with said second outlet;
• (G) second valve means arranged in a brake fluid passage between said second inlet and outlet, and engageable with said valve control piston to block brake fluid flow towards said second inlet from said second outlet, said valve control piston being moved to said second valve means, when an urging force to said valve control piston from said second chamber becomes higher than another urging force to said valve control piston from said third chamber and to be engaged with said second valve means.