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Re: '79 Suburban brake proportioning valve
pics would help buddy... i replaced mine a few years back. was leaking from rear brake lines/proportion valve also. just kept getting worse and worse till i had to fill up the rear resevoir every week.
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"Dennis the Menace"
1978 Silverado (2wd, 1/2 ton, short bed)complete nut & bolt frame off restomod LQ9/4L80E
MY LS SWAP/FRAME OFF BUILD BOOK
2006 TBSS way too much to list 
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