Re: Brake booster problem!
Brown wire is for your brake warning light and should go to the proportioning valve. If you didn't change out the prop valve to one without the switch it should just plug right in. I believe the brake pedal sits quite a bit lower with power brakes than manual if I remember correctly. This is normal.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.  
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