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July 2nd, 2008, 09:01 PM
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what is the purpose of this part?
i've notice that some of the vacuum brake conversions use the part shown below and some do not. what is the purpose of the part and why isn't used in all of the conversions?
bw jones
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GNis4GoodNews 1978 AMC Pacer Wagon w/woodgrain siding 1979 Mercury Zephyr 4-Door Sedan 1974 AMC Matador X Coupe 1985 Yugo GV - low miles (won't run) 1965 AMC Rambler Marlin 1983 Renault LeCar  JUST KIDDING! 
    
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July 2nd, 2008, 09:06 PM
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Someone correct me if I'm wrong but think thats an old style check valve.Newer GM's have the valve mounted directly on the master,much smaller and flatter. tan or black in color I think.
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"Buster" '87 WE4 50# Motrons,TT chip,Pypes 2.5,Accufab AFR,Timmy's old turbo,LS1 MAF,3"d.p.,Big Mouth3.5 intake,Really shiny 20'paint,Don't give a damn how fast it runs cause it just runs good!
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July 2nd, 2008, 09:11 PM
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Thats correct, that is the checkvalve, The newer booster mounted units are sleek, much less bulky!
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New forged stroker in the works for sometime-ish in 08-Race ported GN1's-GN1 intake-Precision PT71GTQ 4 bolt-dual nozzle alky-RJC megacooler-Steel caps-Girdle-218* Roller cam-Maftpro-83lb injectors and some other goodies.....  1986 Grand National-all the goodies to make it work....... Visit my Myspace page, always looking for Turbo Buick friends... www.myspace.com/rysfly
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July 2nd, 2008, 09:16 PM
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Thats probably why you don't notice them on the boosters,they kinda blend in.
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"Buster" '87 WE4 50# Motrons,TT chip,Pypes 2.5,Accufab AFR,Timmy's old turbo,LS1 MAF,3"d.p.,Big Mouth3.5 intake,Really shiny 20'paint,Don't give a damn how fast it runs cause it just runs good!
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July 2nd, 2008, 10:03 PM
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Quote:
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1987 GN, 1986 T, 1984 Hurst Oldsmobile with 1987 GN drivetrain Last edited by mikestertwo : July 2nd, 2008 at 10:05 PM.
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July 2nd, 2008, 10:13 PM
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i just found an informative article in an old GM High Tech Performance magazine regarding the vacuum brake conversion. they claim the part shown above is a vapor trap to catch fuel vapors. it is shown to be used in line between the brake booster's check valve and the vacuum line coming from the vacuum source.
 0405htp Brakes 22 Z Photoanyone have any additional thoughts regarding its usefulness? bw jones
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GNis4GoodNews 1978 AMC Pacer Wagon w/woodgrain siding 1979 Mercury Zephyr 4-Door Sedan 1974 AMC Matador X Coupe 1985 Yugo GV - low miles (won't run) 1965 AMC Rambler Marlin 1983 Renault LeCar JUST KIDDING!
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July 3rd, 2008, 01:42 PM
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Here's another thread. What's this part for?
You know I wonder if you really need it. I see a lot of newer cars in the boneyards that dont use them. I'm thinking the filter is a relic left over from the carburetor days and is not really needed on a modern FI motor.
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Eric Fisher OEM Parts Specialist for GM Vehicles e-mail me at efisher@billheard.com 1997 SCCA Regional Champion. 1986 Grand National #38 ESP 86 Grand National 84 Riviera T-Type 82 Regal engineless
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July 3rd, 2008, 09:11 PM
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thanks to each for your input
.extra thanks to turbofish38 for all his recent assistance ....... he is enormously informative and is a valuable asset to the TB community! bw jones
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GNis4GoodNews 1978 AMC Pacer Wagon w/woodgrain siding 1979 Mercury Zephyr 4-Door Sedan 1974 AMC Matador X Coupe 1985 Yugo GV - low miles (won't run) 1965 AMC Rambler Marlin 1983 Renault LeCar JUST KIDDING!
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