power brake booster vs low vacuum - Team Camaro Tech
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post #1 of 8 (permalink) Old May 10th, 07, 07:26 PM Thread Starter
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Russ
 
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power brake booster vs low vacuum

Does anyone know how much vacuum is required to operarte the power brake booster. I want to install a chrome power brake booster and master cyl. assembly , I was looking at the 7" or 8" assembly for mine due to having a big block with tall valve covers. Car currently has 11" of vacuum at idle. Will that cut it?

Russ
1969 RS conv,hugger orange,396 4 speed,373 12 bolt posi.


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post #2 of 8 (permalink) Old May 10th, 07, 08:11 PM
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Re: power brake booster vs low vacuum

i have the same vacuum with my stroked small block and it works just fine. it has a mildly 'lopey' idle at 650-700 rpm and i've never had any problems. the brake companies want at least 18 inches or so of vacuum at idle, but if the check valve and booster are sealed and working properly, you should be able to store a higher vacuum in the booster after start-up and driving around for when you need it.
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post #3 of 8 (permalink) Old May 10th, 07, 08:13 PM
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Re: power brake booster vs low vacuum

i have 6 in hg at idle with my croosram motor and the brakes still work fine!!!!

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post #4 of 8 (permalink) Old May 10th, 07, 08:27 PM
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Re: power brake booster vs low vacuum

or if you are still unsure, add a vacuum reserve can and mount it on drivers inner fender well. it will give the booster the extra needed vacuum when brakes are applied

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post #5 of 8 (permalink) Old May 11th, 07, 09:49 AM
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Re: power brake booster vs low vacuum

According to the people at Right Suff Detailing (800-405-2000) all vacum boosters need a minumun of 16 -18 inches of vacum. If you are going to go to a smaller diameter you should look into their Dual Slimline. By adding a second diaphram you will increase the assist 25-30%.

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post #6 of 8 (permalink) Old May 11th, 07, 01:18 PM
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Re: power brake booster vs low vacuum

Quote:
Originally Posted by 68Holdon View Post
According to the people at Right Suff Detailing (800-405-2000) all vacum boosters need a minumun of 16 -18 inches of vacum. If you are going to go to a smaller diameter you should look into their Dual Slimline. By adding a second diaphram you will increase the assist 25-30%.
Smaller boosters require more vacuum for the same amount of assist. In this case, bigger is better.

I've run boosters down to 11-13" vacuum and the brakes still felt good. Think about the DZ Z/28 motors...they didn't produce much vacuum, either. I'm not sure where the "16 in Hg minimum" came from...

Matt Jones
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Art Morrison Ent. Inc.
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post #7 of 8 (permalink) Old May 11th, 07, 01:40 PM
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Re: power brake booster vs low vacuum

I was running 6 to 7 with my big block and started to have issues. I then pulled it and stuck in the hydraboost. Not cheap but not stopping when you need comes at a much higher cost........


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post #8 of 8 (permalink) Old May 12th, 07, 05:28 PM Thread Starter
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Re: power brake booster vs low vacuum

Thank's for the replies everyone.

Russ
1969 RS conv,hugger orange,396 4 speed,373 12 bolt posi.


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