Several weeks ago I replaced the brake lines, master cylinder, and wheel cylinders in my 49 chevy 3100. After that I couldn't bleed the brakes satisfactorily and I finally found a small leak where the driver's side real wheel cylinder brass block attaches to the wheel cylinder. The brass block looks OK and the wheel cylinder is new but even after tightening the hollow bolt as much as I can it still leaks. Should I have been putting gasket sealer between te brass block and the wheel cylinder? Any suggestions would be appreciated. Thanks, JD