adjusting brake proportioner valve?

GMC
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RON LOVE
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GMC Pick Up, probable 1977 front end, proportioner leaks; can it be adjusted? rebuilt? New lines and joints leak?? can't figure out why. any suggestions?
Jun 3, 2006 at 10:34 PM
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MICKEY-D
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Check your flares, and check the valve itself for dirt or burrs.
Jan 8, 2010 at 3:52 PM