Anti-locking brake system, rear brake delay valve, and method for same

A vehicle braking system for delaying the flow of brake fluid to the rear brakes, the braking system comprising:

• a master cylinder;
• a pair of hydraulically operable disk brakes respectively positioned on a pair of rear wheels of a vehicle;
• a rear inlet brake line in fluid communication with said master cylinder and connected to said pair of rear disk brakes;
• a rear outlet brake line in fluid communication with said pair of rear disk brakes and in fluid communication with said master cylinder;
• and
• a rear brake delay valve positioned between and in fluid communication with said master cylinder and said pair of rear disk brakes and connected to said rear inlet brake line for delaying at least an initial braking pressure received by said pair of rear disk brakes as related to front brakes responsive to an initial actuation of said master cylinder, said rear brake delay valve including a housing having a first opening connected to a first portion of said rear inlet brake line connected to said master cylinder and a second opening connected to a second portion of said rear inlet brake line connected to said pair of rear brakes, a perforated member having a plurality of openings therein, an elastomeric member cooperating with said perforated member, and a separate predetermined sized orifice extending through said perforated member and said elastomeric member, said perforated member and said elastomeric member each being positioned within said housing in fluid communication with said first and second openings, said elastomeric member being adapted to cooperate with said perforated member so that fluid flowing from said first opening is directed to flow only through said orifice and to said second opening, through said second portion of said rear inlet brake line, and to said pair of rear disk brakes, and said elastomeric member also allowing fluid flowing from said second opening through said plurality of openings of said perforated member to said first opening, and to said first portion of said rear inlet brake line.

A vehicle braking system for delaying the flow of brake fluid to the rear brakes, the braking system comprising:

• a master cylinder comprising a housing having first and second openings respectively connected to front and rear brake lines, a fluid reservoir connected to said housing, a piston chamber positioned within said housing and in fluid communication with said first and second openings and said fluid reservoir, a piston positioned within said piston chamber, and a rear brake delay valve positioned within said housing of said master cylinder and in fluid communication with said second opening and said piston chamber for delaying at least an initial braking pressure received by said pair of rear disk brakes as related to front brakes responsive to an initial actuation of said master cylinder;
• a pair of hydraulically operable brakes respectively positioned on a pair of front wheels of a vehicle;
• a front brake line connected to and in fluid communication with said first opening of said master cylinder and said pair of front brakes;
• a pair of hydraulically operable brakes respectively positioned on a pair of rear wheels of a vehicle;
• a rear brake line connected to and in fluid communication with said second opening of said master cylinder and said pair of rear brakes;
• and
• said rear brake delay valve of said master cylinder including a perforated member having a plurality of openings therein, an elastomeric member secured to said perforated member, a separate predetermined sized orifice extending through a medial portion of said perforated member and said elastomeric member, said elastomeric member cooperating with said plurality of openings of said perforated member so that fluid flowing from said piston chamber is directed to flow only through said predetermined sized orifice, through said second opening and said inlet brake line, and to said pair of rear brakes, and said elastomeric member allowing fluid flowing from said second opening to also flow through said plurality of openings of said perforated member to said piston chamber.

A rear brake delay valve for a vehicle braking system, the rear brake delay valve comprising:

• a housing having a first opening arranged to be connected to a first portion of a brake line fluidly connected to a master cylinder and a second opening arranged to be connected to a second portion of the brake line fluidly connected to a pair of rear brakes;
• and
• a valve means positioned within said housing in fluid communication with said first and second openings for delaying at least an initial braking pressure received by said pair of rear disk brakes as related to front brakes responsive to an initial actuation of said master cylinder, said valve means including a perforated member having a first predetermined sized orifice extending therethrough and resilient means secured to said perforated member for resiliently moving in directions corresponding to fluid flow directions, and a second predetermined sized orifice extending through said resilient means, said resilient means being adapted to cooperate with said perforated member so that fluid flowing from said first opening is directed to flow only through said first orifice of said perforated member and said second orifice of said resilient means and to said second opening, through said second portion of the brake lines, and to the pair of rear disk brakes, and said resilient means also allowing fluid flowing from said second opening through said perforated member to said first opening, and to said first portion of said inlet brake lines.