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09-11-2015, 12:41 PM
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#1 |
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Registered User
 
Join Date: Jun 2009
Location: meteghan centre, nova scotia, canada
Posts: 208
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not enough vacuum for power brake
Only have 11 pounds of vacuum, what to do if I want to install power brakes in my 1972 c10
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09-11-2015, 12:58 PM
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#2 |
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Registered User
Join Date: Feb 2012
Location: Smyrna TN
Posts: 1,153
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Re: not enough vacuum for power brake
I installed a vacuum canister, but I have almost 14 lbs of vacuum. You may need an electric vacuum pump.
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1971 Longbed BB Cheyenne Super 1972 Longbed SB Cheyenne Super 1972 Longbed Highlander Custom Deluxe 1975 K5 4x4 full convertible Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=645165 Greg Smyrna TN |
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09-11-2015, 04:50 PM
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#3 |
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Registered User
Join Date: Dec 2014
Location: Coal City, IL
Posts: 695
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Re: not enough vacuum for power brake
Hydro boost
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Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker |
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09-11-2015, 05:08 PM
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#4 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: not enough vacuum for power brake
Why is the vacuum reading so low?
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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09-11-2015, 05:12 PM
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#5 | |
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Registered User
Join Date: Jun 2009
Location: meteghan centre, nova scotia, canada
Posts: 208
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Re: not enough vacuum for power brake
Quote:
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09-11-2015, 05:23 PM
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#6 | |
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Account Suspended
Join Date: Jul 2015
Location: Traverse City MI
Posts: 147
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Re: not enough vacuum for power brake
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09-11-2015, 06:00 PM
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#7 | |
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Registered User
Join Date: Jun 2009
Location: meteghan centre, nova scotia, canada
Posts: 208
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Re: not enough vacuum for power brake
Quote:
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09-11-2015, 06:07 PM
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#8 | |
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Registered User
Join Date: Jun 2009
Location: meteghan centre, nova scotia, canada
Posts: 208
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Re: not enough vacuum for power brake
Quote:
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09-11-2015, 06:17 PM
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#9 |
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Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,280
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Re: not enough vacuum for power brake
14 should be plenty but put a vacuum canister on it to have some in reserve. The other option is of course change out the cam it can't run that well if it is that big or put on a hydro boost.
On a side note a cam that is just right for say a 350 is gonna be a little on the small side for a 400 or a bunch on the big size for say a 305 or 307 or 283. |
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09-11-2015, 07:36 PM
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#10 |
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Registered User
Join Date: Mar 2015
Location: Seaside,CA
Posts: 142
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Re: not enough vacuum for power brake
I just finished my engine build and had the same concern. I currently am pulling 11-12 in. at idle and my power brakes work fine. Yes there is a little bit of difference from the mild cam I had before, but nothing that I wont get used to. Still stops better than my 06 Tacoma.
I should add that I went from stock power disc/drum to CPP four wheel big brake kit. Last edited by elkniks; 09-11-2015 at 07:40 PM. Reason: more info |
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