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By Montereycruiser - 12 Years Ago
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Hi! New to this forum,wish I´d found it earlier. I´m installing aftermarket power brakes in my 1959 Monterey. It has a 312 engine with 2-barrel Ford carbureter. When it comes to connecting the vaccuum hose for the power booster I have two options: Using the same port in the back of the manifold as used for heater vaccuum valve, that is "A" in the photo, or a vaccuum port on the manifold in front of the carb, that is "B" in the photo. Which one is used on cars with factory power brakes?
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By alanfreeman - 12 Years Ago
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My '54 Mercury with factory power brakes used the vacuum port towards the front of the engine for both the wipers and brake booster. A curved metal metal pipe about 1/2" in diameter connected to the brass fitting in the intake and a rubber hose went from the pipe to the vacuum fitting on the booster. I am now using a '57 "B" intake on a 292 which has no front vacuum port so I had no choice but to use the port at the rear of the intake. The rear port is closer to the booster anyway and makes for a cleaner installation. I don't know what type of setup they used in '59. Alan S. Freeman
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By SwedKarla - 12 Years Ago
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I would use the rear connector. A vacuum tank is also recommended, for better brakes.
The vacuum may be too small. Can interfere with the ignition if you are unlucky. (Without vacuum tank!)
Be sure to bleed the master cylinder before installing it on the car.
Be careful setting of the pressure rod. It is not good if it gets too long.
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By oldcarmark - 12 Years Ago
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Which aftermarket power brake setup are you using?
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By lyonroad - 12 Years Ago
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Swedkarla, what sort of vacuum tank do you use? Thanks
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By junkyardjeff - 12 Years Ago
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I would hook the booster to where it would get vacumn from all 8 cylinders and that looks to be the front port,hooking it to the rear port would look like it would get vacumn mostly from the rear two cylinders and could possibly lean those two cylinders some. If you want to use a short hose find a carb spacer with a vacumn port and hook it there.
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By SwedKarla - 12 Years Ago
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I have the original on my 57. But Summit Racing has an aluminum works perfectly brakes.
Mounted one on a friend's car and it works great. Try this out and get a vacuum gauge so you
can see what happens to the vacuum depending on where you place the connection.
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By lyonroad - 12 Years Ago
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Thanks, I'll take a look.
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By Montereycruiser - 12 Years Ago
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Thanks for taking your time! I´ve been scanning the internet for pics and it seems cars with factory power brakes use the front vacuum port on the manifold. When I pulled the plug I found that there are two holes under the plug, one from each intake port so it gets vacuum from both intake manifold ports, hence, my conclusion is to connect the booster the front port!
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By sprink88 - 12 Years Ago
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I have Old Irishmans brake set up and had to lengthen the rod. That was the only way I could get any stopping power. BUT it was about two weeks of fiddling with it before I figured it out. But that one said take your vacuum can out and hook it directly to your booster
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By alanfreeman - 12 Years Ago
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But if your Mercury with 312 engine had a 4 barrel carburetor, it would have the ECZ 9425-B intake which has no vacuum port at the front, only one at the rear. Where would Ford have connected the brake booster on cars with "B" manifolds and 4 barrel carbs? The only other way I can think of would be a carb spacer with a vacuum port. Alan S. Freeman
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By Montereycruiser - 12 Years Ago
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Since I have the 2-barrel manifold that´s a hypothetical question right now but I guess the 4-barrel manifold has no room for a vaccum port in the front. Probably the Ford engineers built four vaccum channels in the manifold that all were connected to the port in the back of the manifold.
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By marvh - 12 Years Ago
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The F500 trucks with 2 bbl carbs had the vacuum line hooked in front of the carb. It was about 1/2' steel line that ran down along side the drivers side valve cover then a rubber hose to the firewall. The trucks had a large external vacuum chamber for the brakes and the brakes worked very well on these 2 ton trucks.
I would hook up the vacuum hose there.
marv
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By Montereycruiser - 12 Years Ago
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Just to let you know, I have finished the power brake conversion job. I used the front vaccum port on the manifold that was plugged on my car. Everything works great and there is no need for a vaccum tank.
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By paul2748 - 12 Years Ago
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Many small block Fords (289-302) for many years used the back of the manifold WITHOUT ANY CANNISTER. Plus they had two or three things using the same fitting. I don't see why the Y should be any different, assuming you are not using a radical cam.
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By Talkwrench - 12 Years Ago
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I wont hijack this thread but I'll start another "brake fluid colour"
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