Brakes – Operators – Fluid pressure
Patent
1995-03-03
1996-06-11
Graham, Matthew C.
Brakes
Operators
Fluid pressure
411412, B60T 1130
Patent
active
055247369
ABSTRACT:
A master cylinder and novel screws for practicing a novel method of bleeding the master cylinder. The screws are tightened into the orifices conventionally employed for the attachment of brake lines. With these orifices plugged, the brake fluid reservoirs are filled and the piston is forced into the high pressure position. Air or other gas initially occupying the main bore is forced into the reservoirs, and the bubbling is highly visible. When the return spring returns the piston to its original position, fluid is sucked from the reservoirs into the main bore. When bubbling ceases, the master cylinder is considered bled, and is prepared for final connection to the brake system. The screws are removed and brake lines are attached instead. Preferably, the screws are stepped, and include a section of relatively larger diameter and a section of relatively less diameter. Stepped screws require only one wrench size for tightening and loosening, and are interchangeable among threaded discharge orifices of different diameters. Orifices of different diameters are conventionally provided to enable a mechanic to connect brake lines to correct corresponding circuits of the master cylinder. The novel method eliminates cumbersome bleeding equipment, and reduces likelihood of fluid leaks and contamination by exposure to external apparatus.
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Graham Matthew C.
Litman Richard C.
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