I have been bleeding,changing, or flushing the brake and clutch hydraulic fluid on our two older cars which I due every 5 years or 50000 miles. We used to use the two person pump the pedal and hold until the bleed screw is opened and the pedal is near the floor then close the bleed screw method. Which is done until the fluid color changes and no bubbles show. I lately have been using a power bleeder which uses vacuum to the open bleeder screw, to suck the fluid out which makes it an easy one man job. One problem though is that bubbles appear in the fluid from air leakage around the bleed screw when it is opened. I have tried packing a putty around the screw threads which sometimes work for a bit, but not for long. The question being is there any way to stop the air seepage around the bleed screw threads? I have upon occasion used almost a quart of fluid to be sure all the air is out of a repaired system, and I still do not feel confident. Any suggestions or hints??
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