[jlcvwf423]

Hey everyone!
I own a 1967 mustang with a 289 and an automatic C4 transmission. I need to know EXACTLY where the modulator line connects to on the engine. Currently I have it connected to that little brass fitting at the back of the manifold that the power booster also connects to. I know its now supposed to go there because the fitting has three ports - one for the booster, one for the smog, and the last for the steering tilt canister. (I removed all of my smog components by the way) also, the metal portion of the modulator line doesn't ends very close to the fitting. I have looked at many vacuum diagrams and none of them have shown the modulator line. I attached some pictures of my current setup. Any help would be appreciated.

 

[Ivy66GT]

Depending upon what options you had the metal tube was different but for most '67 Mustangs the modulator line connected to that manifold connection through some sort of metal tube. Some of them curled up and behind the air cleaner and were tapered on the hose end like those on a '66. The loop in the hose was at about the same height as the top of the air cleaner before it went down to the tranny. Some of them 'exited over the left valve cover' like you show.

Mustang & Ford Small Block V8, 1962-1969

With the tapered tube end especially they didn't use a clamp since there is no need for one. Vacuum sucks the hose onto the pipe so it needs no clamp.

BTW, what's a power booster? I suppose you mean power brake booster? If you had power brakes then the P/B hose was connected at the back of the manifold with the metal tube and "the A/T vacuum hose was connected to a special fitting on the power brake booster." They gave the brakes the best connection to the vacuum source.

 

[jlcvwf423]

You are correct, i meant brake booster. what you said about the A/T modulator line being connected to the brake booster makes perfect sense because the line stops right next to it. I have looked at replacement modulator lines for 1967 mustangs and most come with short rubber tubes on the end which would not reach the brass fitting, but could definitely reach the brake booster. Now, where would the line connect to on the booster. Would it connect to the check valve? I don't see any way to connect it to my booster, but mine might have been replaced and may not be the same as the original.

 

[Ivy66GT]

Unfortunately, there is no picture of that detail and my (former) '67 had manual brakes. The connections were only done that way on Mustangs and Cougars so you need to find some pictures of an original A/T & P/B '67 Mustang/Cougar.

 

[jlcvwf423]

ok, the hunt goes on. Thanks for all your help!

 

[jlcvwf423]

I think I found what im looking for! Take a look at these power boosters that Autozone sells.
Brake Power Booster | 1967 Ford Mustang 8 Cylinders C 4.7L 2BL OHV | AutoZone.com.
The midland boosters all have two connections on the check valve. However, my mustang is equipped with a bendix booster, and from the picture, it looks like the check valves on the bendix boosters only have one connection. I need to replace my booster any way because the brakes feel like crap when the engine is on and the booster is the only brake component that hasnt been replaced. Do you know what the difference is between midland and bendix boosters? My guess is that the midlands and better because that are more expensive, but a midland may not fit in my mustang.