I wont hijack this thread but I'll start another "brake fluid colour"



"Came too close to dying to stop living now!"

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.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

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.

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

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.

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

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

1957 Fairlane

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!

Thanks, I'll take a look.

Mark

1956 Mercury M100
1955 Ford Fairlane Club Sedan
Delta, British Columbia

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.

Drives: Mercury Montclair 1957th

www.mercury1957.com