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04-03-2004, 11:17 PM
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#1 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Booster Vacuum Question
I HAVE PUT TWO (2) BOOSTERS ON MY TRUCK BECAUSE THEY ARE NOT HOLDING VACUUM.....
LEAVE IT SIT FOR A DAY NO VACUUM..... YES IT'S GOT NEW CHECK VALVES.....TWO INLINE AND YES I GREASED THE RUBBER GROMIT TO MAKE SURE IT SEALS.... SO...ARE THESE THINGS SUPPOSED TO HOLD VACUUM.... FOR DAYS ...YEARS...I THINK SO.... EVERY TIME I START MY RIG IT HAS TO SUCK THE BOOSTER DOWN.. AND MESS'S UP THE CHOKE...... PLEASE ADVISE 
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04-03-2004, 11:50 PM
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#2 |
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Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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Wish I could be of help, but I too have had poor luck with boosters. Three used units so far, all worked for a while. Probably dry rotted diaphrams. I wonder if anyone sells the rebuild kits.
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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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04-03-2004, 11:55 PM
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#3 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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WHAT SUCKS IS THESE ARE REMANUFACTURED UNITS
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04-04-2004, 12:10 AM
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#4 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Pedal is supposed to go down when you start truch after sitting awhile. To see if it is working (holding vacumn) start truck then cut off--pedal should have about 2 pedal pumps under boost and then just feel like it is solid. Mine works the way you describe yours.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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04-04-2004, 02:11 AM
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#5 |
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Registered User
Join Date: Nov 2003
Location: Alexandria, VA
Posts: 1,534
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I lost my power brakes on a cross country trip in the '72. I was on I-40 headed east from Las Vegas to Maryland. Lost the boost in eastern New Mexico and tried to find a booster in several towns in Texas, and was told they could have it in a day or two. Well, I was in a hurry and low on cash so I fought that thing all the way to Nashville, where my brother met me with a used booster. Power brakes without vacuum is 4X worse than manual drum brakes!
__________________
'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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