I have a 1967 mustang and am replacing the vacuum booster. I have a question about the small stud on the booster. The vacuum booster that came off the car had a plate welded to this small stud with a spacer between the plate and booster.There are 4 other bolts from thevacuum booster going through the plate thatgo through the firewall each with spacers between the plate and booster but not welded.The rebuilt vacuum booster that I got from the part store did not have this plate welded to the stud. If fact it did not come with a plate at all. Has anyone else seen this problem? Does anyone know what the small stud is for? What did the original vacuum boosters look like in 1967? Was this plate suppose to be welded on? Or is the old booster on the car a aftermarket replacement? Also does anyone know what color the boosters were originally?
Larry.

 

I kind of have an idea of what you're trying to explain. I just replaced the booster in my 68 and it had the spacer plate also on the back of the booster that mounts to the firewall but it wasn't welded on. The most important think is that the rod that connects to the brake pedal is the same length as the old one. If you have pictures I might be able to help out a little more....sorry.

 

I will take some pictures after work today. How many studs come off the vacuum booster that you installed? Did all of them go through the fire wall?

 

When you say studs are you referring to bolts? If so, there was one bolt that went through the spacer bracket into the firewall from the engine side and four bolts that went throught the firewall and nuts were put on inside the car.

 

That is exactly how my was. One bolt that went through the spacer bracket into the firewall and four studs that went through the firewall and nuts on the inside, but there is a six small stud that is barely longer than the spacers coming off the booster. It is a threaded stud. Any idea what it is for?

P.S. Bolts have a place to put a wrench to turn the threaded part, studs are just threaded rods. Both use nuts to tighten things to them.

 

You put a nut on the stud to hold the assembly in place - no othe function.
Jim

 

Where did you get the booster? When I got my new booster I had to reuse the old spacer because the new one didn't come with it. There wasn't anything welded to it so I'm not sure what you're referring to with that.

PS: Never correct someone when they are trying to help you. Just kidding. Thanks for the info.

 

I got the booster from Advance Auto Parts. It did not come with the spacer plate either, so I had to drill off the plate from my old booster, since it was welded to the small stud. Now my plate has a holein it were this small stud is. Really, I was not trying to correct you. I am just trying to be as specific as possible to make sure I put this thing back on as safely as possible. I don't want to have any brake failures at 65 mph.

 

I know, I was only j/k with ya. I wouldn't worry about that hole you drilled. As long asyou get the booster to bolt back up like the other one was, the biggest worry is that the push rod is going to be the correct length to fit the brake pedal bracket mount. If that is good just make sure it's bolted up tight to the firewall and you have the pin in where the push rod hole mounts to the pedal bracket and you'll be fine. Of course make sure you have your vacuum line connected back to the booster and all you brake lines are snug to the MC. After that, your only worry is that the push rod in the MC is the correct length. no worries......

 

Ok. I got the booster mounted back onto the car and the brakes seem to be working fine now. Does anyone know what color the original vacuum boosters were in 1967? This rebuilt one is a grey primer color and I would like to paint it.