Hi to all team chevelle members....sorry I am not active in providing info or answers to questions, as I am a learner at this point...and learning alot from this great site and all you team players.
All problems or questions I have encountered have been answered in previous posts, but now I am coming up short on this one and hope someone can help.....Questions are.... (vacuum pump I got from donor car chev celebrity)
How much vacuum will this unit produce?
Where do the 2 hoses connect?
Why these questions?
I have done an all drum manual to front disc, 11" rear drum power brake conversion to My chevelle wagon project, and the cam in it is eating up all of my vacuum, and the power booster is the small 7 or 8"........End result as you know
......NO Brakes Thanks TC

MP Brakes sells an electric pump kit for around $400. The pump is made by Gast Mfg.

www.gastmfg.com (http://www.gastmfg.com)

Go to the product literature section for small vacuum pumps and look at the 15D1150 series and the 22D1180 series - I bought the 22D, the muffler, and the relief valve. You will need an adjustable vacuum switch which you will be able to get from the same supplier that you find for your area on the Gast site. Total $'s out of pocket for me was around $140. I bought mine from SW Controls out of Houston - you can do google/yahoo for their site. I'm probably going to bag the vacuum switch and just use the vacuum relief with an on/off switch on the dash. I put thick rubber grommets between the pump base and the fender well where I mounted it - not that noisy, but you can hear it when it's running. I get 23" and my brakes work no matter what. I have a T to the manifold so if I lose the pump power, I still have about 11" to help me bring the beast to a stop. Still dialing her in with the new 434, but initial test are rock solid on the pump's effect.

Also, take a look at http://www.godmanhiperformance.com. Look under brakes and they have a vacuum pump as well - more compact with everything self-contained but more expensive.

Finally, bounce over to Team Camaro and do a search on electric vacuum pumps. That is the site where the $400MP = $100 Gast situation was first posted. There is also a distributor listed for the vacuum switch.

Thanks Mike for the info on vacuum pumps.
The questions I have are for the pump described in this link:
http://www.gmcmotorhome.com/tech/vacuum_pump/index.html

Again thanks R C

Yeah, I missed the cavalier past in your post. I didn't want to do the junk yard search thing so bought a new kit since the GM/AC-Delco pump has been discontinued. However, the Godman comes pretty close to that original GM setup.

I like the extra margin of 5" (for a total of 23") eventhough I only need 18".

Best,

http://www.hydroboost.com/

This looks really interesting.

I put a vacuum pump on my '69 a couple of years ago. It was much better than relying on the brake booster alone, but to me it's still not that great. Frequent braking can still create a really hard pedal, and at the bottom of long hill I sometimes still have to lift my butt off the seat pressing on the brakes hoping for a stop.

I'm thinking seriously about this hydraulic brake booster. It sounds simple, a straight bolt in, the price is a little more than I want to pay, but what're you gonna do? There was an article on these things in Chevy High Performance this month. I wonder if anyone else here has tried this thing?

I just finished installing a hydroboost system on my 69. It works great! The kit was complete, easy to install, and fit nicely into my engine compartment- definitely more clearance for tall valve covers than the Vacuum booster. I installed a procharger blower on the 454 motor, so I didn't have enough vacuum, also I've added too much stuff under the hood and didn't have room for a vac cannister or vac pump. I was going to install them in the trunk, but didn't want the long plumbing. The brake system consists of CPP drop spindles with drilled discs up front, and Seville rear brakes (also with drilled rotors. If anyone is interested, I have a brand new vac booster and master cylinder that were part of the CPP kit; They were installed, but have only about 10 miles on them before I switched over to the hydroboost- let's make a deal!

Wilbur, so you like the Hydroboost?? I've just about talked myself into biting the bullet and getting that set-up. I'm tired of hard-as-a-rock brakes at the worst possible moment. Do you know if these things create any increased drag on the power steering pump. How much might it slow me down?

Larry:
You know how it is, if it's not one thing it's another. I got the hydroboost installed, did some test driving, and now the engine is on the fritz. BUT, while it was running, the stopping was great: smooth, consistent whether at idle or 70 mph,and didn't appear to be affecting the steering. I'm running one of the small pumps with remote reservoir due to the blower, but it shouldn't be any different with the stock pump. The pressure line runs from pump to brake booster to steering gearbox, so it's a series rather than a parallel arrangement. Plus the booster has a gas cylinder that stores enough pressure for a couple brakes if the pump quits. I've heard a burst pressure line will make a real mess, but it's all high pressure braided stainless, so I'm not too worried. As a point of reference, the Audi 100 I used to drive had the same basic arrangement, the only problem I ever had was when the belt broke (due to age and brittleness) and I suddenly had manual steering and brakes. It didn't have a reservoir, so the transition from manual to power brakes was instantaneous, but even then it was manageable. In case you are interested, I have another hydroboost unit I bought prior to buying the complete kit. It fits a standard short-pushrod master cylinder, and you would need to fabricate a mounting plate and adapt to the brake pedal, but it is in great shape. It would be a cheap way to go if you are interested.

Thanks Wilbur for the offer. But I think if I do it, I'm gonna just go for it and get the whole kit from Hydroboost, probably with a new MC too. Glad to hear your brakes are great.

Wilbur,

I may be interested in the hydroboost unit, but not sure what all I would need (other than what you listed) in order to make it work...seems like a good option...could you please email me (jnr_design@hotmail.com) for details and how much, etc...thanks!

John: You have mail. sorry for the delayed response, I've been out of town (work always seems to interfere with what I want to do).

Larry,
Please email me, I have some pictures of my installation to send you, just to show how well it all fits.
Wilbur