Thread: Vacuum for Power Brakes!

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Originally Posted by curmudgeon

6 to 1 ratio.

Any way (room?) to increase this?

Not knowing what intake your running, I would move the vacuum hose for the brake booster to the connection now plugged under the carb. It probably won't change anything but it may increase the speed the 10 inches is acquired. You may be connected to a single runner now and being under the carb may increase the vacuum pulses. Probably not enough to really notice but it won't hurt to try.

It seems you know the answers to the questions readily so should I/We assume you've been dealing with this for a while?

You have a couple choices I'm thinking.
1. increase the brake pedal ratio as much as you can.
2. replace the booster with a wider unit if possible,
3. install a vacuum pump to increase vacuum "pressure"...

The larger pedal ratio will increase system pressure by using more leverage against the master. The wider diameter booster will apply more force when compared to your current booster. And the vacuum pump will also increase system pressure by increasing the force applied inside the booster. I think options 1 and 3 are the most effective, but not knowing your car, it's a swag for sure.

Do you or have you tested brake system pressures? If you could install a gauge and record system pressures front & rear as a starting point. then when you make a change, you can re-test and verify if your changes are having a positive effect!

Great idea!

I thank all of you for your ideas! The truck is presently at a friend's house having an
oak roof structure built for it. As soon as I get it back I will get after it with a vacuum gauge, relocate my vacuum takeoff at the carb base and go from there.
I will keep you posted as I sort this out and let you know what I find!
Thanks! Joe