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The pump shown is too small to work much on power brakes.
I built one a few years ago along the same lines but then noticed that I don't really need vac for my brakes.
CFM is the key factor. Not how much pressure they can create, as a tire pump.
 

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Discussion Starter · #3 ·
I think you can store the vacuum in another container like you do compressed air. This would be like a trickle charger I guess.
 

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Yes, you could, but try out the storage tank on an average 3 block drive and see how much vacuum is left and how fast the vacuum pump replenishes it.

The larger the tank, the slower the refill before the next brake application.

I used a 2 gal tank and pulled a good vac on it and then drove around town a bit to see how long it assisted the brakes.

Not long so you need a good CFM pump to keep vac as needed.

My car is lighter than when original so the power assist is really not needed.

Working on a bigger bore pump now.
 

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Discussion Starter · #5 ·
Yes, you could, but try out the storage tank on an average 3 block drive and see how much vacuum is left and how fast the vacuum pump replenishes it.

The larger the tank, the slower the refill before the next brake application.

I used a 2 gal tank and pulled a good vac on it and then drove around town a bit to see how long it assisted the brakes.

Not long so you need a good CFM pump to keep vac as needed.

My car is lighter than when original so the power assist is really not needed.

Working on a bigger bore pump now.
Thanks for the advice. Let me know how the new pump works. My wife will be driving the truck so I think I will need the power assist.
 
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