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Old 01-22-2009, 01:11 PM
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"electric vacuum pump for the brake booster"

Hey guys:

I've got 10"-11" vacuum available to a 7" single diaphragm booster serving an 11"disc/drum brake system. I have brakes (about like the o/e manual brakes on the 57's) but little or no power assist. Installed this system w/o really researching the brake issues and so have to make a move to get some assist. Wondering if anyone who faced a similar situation might have tried an electric pump and if you did, how did it work out. It seems the way I probably should have gone for power assist would have been the 8" dual diaphragm with the pump in order to compensate for lack of vacuum.

Thanks for the help.


Joe DA

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Old 01-22-2009, 05:17 PM
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My bud did the electric pump,on his 35 Chev,350 with a cam.Works good for him.
Was around $300. ,not sure of the make of pump.Can find out more if you want,but wont be right away.
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Old 01-22-2009, 06:44 PM
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"electric vacuum pump for power assist brakes"

Hey kruzr:

Thanks for the reply. I have seen them advertised starting at $257, and I guess it's like everything else, we get what we pay for! Naturally when it comes to brakes I'm thinking of the reliability and maybe that costs a little more. If you can , let me know the brand he settled on.

Thanks,

Joe DA
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Old 01-23-2009, 10:25 AM
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I went with an electric vacumn pump on my car.
I don't remember the brand though.
It works very well.

CRS has hit me.!!!!!
Just checked my web page.
it says the brand is ECI.
here is the link to that page.

http://www.geocities.com/jon72vega/m...rcylinder.html

Edit:
Guess I need to update that. I did install the rear disc brakes & Wilwood proportioning valve years ago.

Jon
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Old 01-23-2009, 11:17 AM
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"electric vacumn pump for the brake booster"

Thanks Jon for the info and the reference to ECI. Going to check them out for their prices, etc. Really nice looking brake set up on the pictures.


Joe
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Old 01-23-2009, 01:56 PM
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master power brake sells two types, and both cut off when the vac is reached some run continuously. The only reason for an electric pump is the cam factor, if your car has a stock cam then the booster itself will need to be bigger especially on a 57 chev, dual diaphram at the very least when using the smaller boosters.. Master power brakes explains this very well and has information about pressures and assist numbers.. It is the physical, deign that determines the amount of assistance the booster will proved.

Get their catalog, worth the information alone that is provided there, good explanations on every part of the brake system, the Chilton's Manuel on brakes

good luck

greg
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Old 01-23-2009, 06:37 PM
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"electric vacuum pump for the brake booster"

Greg:

My 57 has comp cam's Magnum 280 with enough overlap to reduce my vacuum to 10"-11" at an idle of 800 rpm. I guess I was asleep at the wheel when I installed the braking system and let (sales) people influence my choice w/o first researching the engine/vacuum potential. As you said, if I had researched Master before installing I probably would have gone with an 8" dual and a pump if I wanted the power boost. Going to look up your reference to the Master people now for the final touches.

Thanks,


Joe DA
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Old 01-23-2009, 09:21 PM
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Quote:
Originally Posted by Joe DA
Greg:

I guess I was asleep at the wheel when I installed the braking system and let (sales) people influence my choice w/o first researching the engine/vacuum potential.

Joe DA

Hard to say , whenever you start to change stuff these things will pop up, nice part about it .. it can be fixed and down the road you go.. Have a lumpy cam also so I run a pump , got to love a shaking car , with a crispy angry idle belching out the pipes... beats TV

link

http://www.mpbrakes.com/
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Old 01-24-2009, 05:30 AM
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Heres a nice looking vac pump from CVR,(Clay Valley Racing).
http://www.cvrproducts.com/vacuum_pump.html
Guy
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Old 01-24-2009, 06:59 AM
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Most boosters need 15 to 18 inches of vacuum. On a 57, part of your problem may also be a 7" single diaphragm booster. If you have the room, I'd use a 9" single diaphragm or at least a 7" dual diaphragm booster.
Stainless Steel Brakes Corp. also has an electric vacuum pump.
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Old 01-24-2009, 11:17 PM
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Have you considered hydroboost?
Shane
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Old 01-26-2009, 10:08 AM
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"electric vacuum pump for the booster"

Shane:

I've stayed with the o/e steering box but if I had installed ps, I'd probably go with the hydroboost.

Joe
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Old 01-26-2009, 10:50 AM
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"electric vacuum pump for the booster":

Bluejackets67
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Old 01-26-2009, 10:58 AM
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"electric vacuum pump for the booster":

Bluejackets67:

From the replies I've gotten it seems you're right with the consensus of opinions that the 7" dual diaphragm booster and an electric pump would deliver all the built in capability of the booster and my brake components. I'm going to get a pump and see how it does with my present 7" single diaphragm. Checking into Stainless Steel and Guy's tip on CVR for $ and warranty.

Thanks for the reply.


Joe DA
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Old 01-27-2009, 05:23 AM
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If you want a cheaper source for a pump, there were several models of GM cars in the 80's that used a vacuum pump, including some big motor homes and even some compact cars. I don't have a link handy, but I've run across a site where someone listed all the GM cars that had the electric vacuum pump.

Bruce
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