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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Vacuum source: Power Brake Conversion

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Old Mar 10, 2023 | 04:02 PM
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Vacuum source: Power Brake Conversion

I'm sure this is talked about in multiple threads but I haven't been able to locate it so please excuse the repeat. I am doing a power brake conversion on my '69 F100 with a completely stock 302. Would it work to just tee off of the PCV valve that runs to the valve cover to obtain vacuum? I also have the plug pictured that I could draw from but haven't been able to find a manifold port that would screw in there (I probably am not using the right keywords in my searching). Any insight would be helpful!

 
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Old Mar 10, 2023 | 04:20 PM
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The one you have circled above is where the brake booster hooks up. You use the large port. I dont know what size it is. This is not a pic of my truck but one off this site.

 
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Old Mar 10, 2023 | 04:48 PM
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Nice, perfect thanks! If anyone knows the size that would be great. I am assuming 1/2 with a 3/8 output but not sure
 
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Old Mar 10, 2023 | 06:27 PM
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If your not using the other vacuum ports, just get a 90 that threads into your intake with the correct hose size to match your brake booster.
 
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Old Mar 10, 2023 | 09:53 PM
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I'm not using those ports. I plugged them after deleting on that ridiculous blue vacuum thing in the background. Let the hunt begin for a brass fitting that works! Thanks
 
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Old Mar 11, 2023 | 11:08 PM
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Originally Posted by leonedavis
I'm sure this is talked about in multiple threads but I haven't been able to locate it so please excuse the repeat. I am doing a power brake conversion on my '69 F100 with a completely stock 302. Would it work to just tee off of the PCV valve that runs to the valve cover to obtain vacuum? I also have the plug pictured that I could draw from but haven't been able to find a manifold port that would screw in there (I probably am not using the right keywords in my searching). Any insight would be helpful!
unscrew what you circled and go down to Napa auto parts and they’ve got bins of various fittings the parts clerk will grab you what you need. There’s usually that one guy who works there that is great for questions like this too
 
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