Adding a power booster to a manual brake system for 73 Valiant auto s six

[TOM RONOLLO]

Hi all:
I am a new member and thank you for this opportunity to ask a question. First of all, I hope I am doing this correctly. I did not know how to continue the thread. I wanted to know where to attach the vacuum supply line from the booster to the engine (or carburetor). I am adding a power booster to a previously manual brake system, I am sure I need a proportioning valve, but where do I connect to draw a vacuum to the booster, and what size diameter hose is recommended. (I guess that makes two questions). Someone said to "T" off the main hose that goes from the valve cover to the carburetor (larger hose). Is this advisable? Either way, thank you in advance for any reply It is for a 1973 slant six automatic valiant, with front drum brakes. I purchased a booster brake kit from Cardone. Also the car has no AC.

 

[Kern Dog]

Are you looking to add a booster but keep the drum brakes?
Did you know that DRUM boosters are different from DISC boosters?
If you are looking for improved braking performance, front discs alone are a great improvement. NON power discs are actually pretty good. I have set up several cars with a front disc/rear drum NON power system and they stop really well. Boosted 4 wheel drum setups often have wheel lockup problems.
I know my response isn't what you asked for but I figured that you want to get the most for your money.

 

[BillGrissom]

Don't tee off the valve cover hose. That is not a vacuum, just a "breather" that should be close to 1 atm. On a slant, the intake manifold should have a vaccum tap on the rear runner. If you have anything vacuum-operated (a 1973 surely does for emissions at least), there will already be hoses connected. Booster vac hoses are fairly large (~1/2"D). If your tap doesn't have a large nipple, you can steal one off a junkyard car, and could be any Mopar thru the 1990's or so, or search ebay.

If you don't have a booster, you can buy a new one w/ brackets and MC for ~170 on ebay. In my avatar, you can see a booster/MC from a ~98 Breeze on 74 brackets in my 65 Dart. That was before the cheap ebay ones. I used the Breeze booster hose too. If staying w/ drums, you probably don't need a booster. My 1964 Valiant is such (search post). I installed a 98 Breeze ABS MC on a 2-4 bolt adapter plate ($30 ebay). That is a 7/8"D bore, which gives an easy pedal. I went booster on the Dart because I hope to later change to front disks.