Vacuum hookup on 65 200

[Anonymous]

I'm not sure if this is the right place to post this or not, if not I appologize. I am putting power brakes on my 65 mustang. I have been looking at a place to hook up the booster vacuum hose. There is one open port on the carb plate, but it seems awfully small in diameter to pull enough to operate the booster. I am wondering if I can use the large port that is hooked to the PCV valve and reroute the PCV into the breather using a filter hookup like on later model cars. I can't think of a reason why this would not work, but it is always good to get a second opinion. What do you guys think?

 

[Alabama65stang]

I have mine hooked up to the hole in the carb adapter with no problems. The auto transmission modulator line comes off of this port also. Someone on another site told me that there is a slight possibility of oil from the PCV line making its' way to the brake diaphram and causing a leak if you hook it up off that line. If you try to pull the PCV with the breather, you won't have enough vacuum to get any flow through the crankcase. The line from the breather to the crancase on most late model cars is not the PCV valve line, but a fresh air line, with the PCV valve on another line to the intake manifold.

Mine works fine off the port in the carb adapter.

 

[CobraSix]

Remember, the use of vacuum on the brakes is just basically a hydraulic system. Even though a gas can compress, it still will act relatively the same as a fluid for sake of arguments. What the vacuum assist needs is a vacuum to help the brakes out. It really doesn't matter what the size of the hose is as it will still be putting the same vacuum on your brakes.

But then again, I only have manual brakes, so I really can't say...

Slade

 

[Anonymous]

I didn't want to hook the PCV and the booster to the same line, I wanted to hook the PCV to the breather and use the vacuum port that it was hooked up to hook up the booster. I know that it will pull enough vacuum through that port, but will the PCV be ok running through the breather. I feel like it will, just looking for some confirmation or someone to tell me different. Thanks

 

[Anonymous]

hi,
the usual filler cap on these is closed, not vented. if you run the pcv valve to it, you will in effect made a closed sealed system. there are pressure pulsations created within the crancase with a lot of vapor moving around. either you should open up to an atmosphere vent system or stay with the vacuum system. i learned this on an early v8 setup similar to what you are mentioning. it was blowing out oil everywhere and i couldnt seal the valve cover gaskets until i went to open air brether stacks. i couldnt use vacuum at that time since i could only get about 5psi due to my cam and carbs.
as long as your engine is in descent shape you wont be getting a mass of oil moving past the vacuum takeoff for the power booster. just be sure you route the lines so there can be no direct drainage of oil residue to the power booster line. frankie