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  Brake Booster vacuum question

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Author Topic:   Brake Booster vacuum question
Mpcoluv
Gearhead

Posts: 446
From: Charlotte NC usa
Registered: Apr 2001

posted 03-19-2002 10:50 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
Hi Guys,
What is the minimum manifold vacuum htat power brakes will work well with? How low can you go with a vacuum canister?

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SteveLaRiviere
Administrator

Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99

posted 03-19-2002 01:51 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I believe around 12" Hg because they do need to allow for safe braking with poorly running stock engines.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

Civilization is a limitless multiplication of unnecessary necessities. -- Mark Twain

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Dave Gibson
Moderator

Posts: 5794
From: Pensacola, Florida, USA M&M#166 MCA#47921
Registered: Aug 99

posted 03-19-2002 06:17 PM     Click Here to See the Profile for Dave Gibson   Click Here to Email Dave Gibson     Edit/Delete Message   Reply w/Quote
Yup, 12 to 14 is what you need.

Dave & Terri

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Poison Ivy (Dave's)
'65 Fastback Modified 289 4V, C-4, dual exhaust, styled steel wheels, rally pac, A/C
Blue Belle (Terri's)
'66 Coupe, Silver Blue Metallic, 351W 2-V, 4 speed, A/C, future sleeper.

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Mpcoluv
Gearhead

Posts: 446
From: Charlotte NC usa
Registered: Apr 2001

posted 03-19-2002 07:31 PM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
Well, can I get by with 10.5" of vacuum and a vacuum canister?

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SteveLaRiviere
Administrator

Posts: 24286
From: Saco, Maine Toys: '70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
Registered: May 99

posted 03-19-2002 08:07 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Sure, as long as you have a vacuum canister. They also have vacuum pumps. You may even be able to find one in a junkyard on a diesel powered vehicle.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

Civilization is a limitless multiplication of unnecessary necessities. -- Mark Twain

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70 Pony
Gearhead

Posts: 1769
From: Glenmoore, PA, USA
Registered: Jan 2000

posted 03-20-2002 09:31 AM     Click Here to See the Profile for 70 Pony   Click Here to Email 70 Pony     Edit/Delete Message   Reply w/Quote
After changing my cam...my power brakes were no where....
Installed Crane's Vacuum reserve cannister, and now I can stop......
Pretty sure it was about a $40 or $50 item.
Like Steve said though, there are some "Bone yard" pumps out there...

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EDDIE D
Resto Mod '70 Sport Roof
Arrest Me Red
'02 GT, Torch Red

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