In FIG. 3, a slightly modified form of brake bleeder valve according to the present invention is illustrated. The modified form of brake bleeder valve 10' is identically formed as the first embodiment 10, with the exception that a cylindrical tubular insert 30 is pressed fit within the outlet passage 13 formed through the hose fitting 12. The press fit tubular insert forms an annular abutment face for the upper end of the spring 17. It should be noted that the insert 30, instead of being press fit may be formed with a threaded connection within the passage 13 in engagement with complementary threads formed within the hose fitting 12. Through the engagement of a flexible tube 32 having a first end 34 frictionally engaged with the hose fitting 12 and an opposite end inserted within a suitable receptacle (not shown), the brake fluid expelled during the brake bleeding process may be collected.
As shown in FIG. 2, an elongated cylindrical passage 23 extends centrally through the brake bleeder valve body and intersects the transverse outlet passage 22, adjacent the conical tip 24. An enlarged diameter spherical seat 15 is formed in the upper end of the bleeder valve body portion, within the hose fitting 12. An annular shoulder 19 is formed around the cylindrical bore 23, and forms a seat for an upper end of a coil spring 17. An opposite end of the spring 17 is in engagement with a spherical ball check valve 21, which is illustrated in an closed position, in engagement with the intersection of the upper end of the cylindrical bore 23 with the spherical seat 15. The cylindrical central bore 23 extends upwardly through the hose fitting 12 through a cylindrical opening 13. A dust cap is frictionally engaged over the hose fitting 12 and has a hemispherical top portion 26 which intersects a cylindrical portion 27 having a radially inwardly extending annular flange 28 which forms a bottom circular opening dimensioned for frictional engagement with the neck portion 14 of the valve body. The dust cap is formed from a resilient material and has sufficient flexibility to be manually inserted over the hose fitting 12. In use, the brake bleeder valve 10 is utilized to replace the conventionally formed brake bleeder valve within a brake wheel cylinder. When it is desired to bleed air from the brake system, a wrench is utilized to slightly loosen the brake body by engagement with the wrench flat 16. This slight loosening of the valve body moves the conical tip portion 24 out of engagement with the complementary formed valve seat within the brake wheel cylinder, and provides a fluid connection through the passages 22, 23 and 13 with the brake wheel cylinder. The dust cap 26 is then removed and the brake pedal is pumped. As the brake pedal is depressed, trapped air and a small quantity of brake fluid is urged upwardly out the passage 23 and forces the ball 21 upwardly, against the bias spring 17. The trapped air and a small quantity of brake fluid are then exhausted through the outlet passage 13 formed through the top of the hose fitting 12. When the brake pedal is released, the spring 17 forces the ball 21 to the illustrated closed position, preventing the induction of air into the brake wheel cylinder. The brake pedal is merely repeatedly pumped, until all the air has been exhausted from the system. At this point, the brake bleeder valve 10 is retightened by engagement of a wrench with the flat portion 16. As the brake bleeder valve is tightened, the O-ring is depressed, which prevents any air or fluid leakage pass the threads 20.
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With reference now to the drawings, and in particular to FIG. 1 thereof, a new and improved brake bleeder valve embodying the principles and concepts of the present invention and generally designated by the reference numeral 10 will be described.
As may now be understood, the brake bleeder valve of the present invention may be inexpensively substituted for the conventional brake bleeder valve provided as original equipment on each brake wheel cylinder of a vehicle. Upon subsequent brake servicing operations, the trapped air may be expelled from the hydraulic brake system by only a single individual, thus saving considerable time and attendant expense.