Master Cylinder question???

[Stangboy67]

I'm setting up a late model power booster/MC install in my '67 and I have a question or two. The booster/mc is out of a '90 5.0. What is the hole on the bottom-center of the master cylinder for? It is right under the brake line port closest to the booster, "pointing" strait down, threaded and looks as though a brake line would screw in it? It is also wet with what appears to be brake fluid.

I wasn't the one that removed it from the car. Does a sensor screw in here that I can just plug? Also, just to make sure, which port serves which set of brakes? On the '67, the front port is for the rear brakes. Is this the same on this '90 version?

Thanks for your help!

 

[srothfuss]

I'm not sure... let me look for some pictures to see if I can help you out.

Edit - it's the best I can do at the moment... Let me dig some more for a better shot

 

[srothfuss]

I can't find anymore pictures that I have stored online. If no one else comes along with information, I'll make a phone call and find out what is attached to that port on the bottom.

 

[Stangboy67]

srothfuss, thanks for the help. Unfortunately I can't tell from that photo. I suppose I could pop the hood at a used car lot

 

[thehueypilot]

Try this link:http://www.svo73mm.cjb.net/

 

[Mustang5L5]

The Fox Mustang has a VERY odd brake setup.

The MC has 3 lines coming from it.

2 of those 3 lines go to the distribution block just underneath. One line then feads both rear drums, the other line feeds the passenger front brake only.

the 3rd line off the MC goes DIRECT to the driver's front brake.

It's a terrible setup that results in the front brakes seeing unequal pressure and causing the driver's wheel to lock up before the passenger wheel.

I would try to use a 2-port MC before using the 87-93 3-port MC setup.

 

[trbkrb]

If you want to use that MC, you can get a plug for it. A friend that has installed line locks on several Fox cars plumbs the two front lines together after the distribution block, and just blocks off the 3rd port. It looks like he uses a 10M x1.0 set screw.

 

[Stangboy67]

Thanks all. That clears it all up rather nicely.

trbkrb, did plugging the one port work well? I might just go out and get a 2-port MC and be done with it. So, from what I understand, the smaller the bore the lighter the pedal effort all else being equal? Will a disk/disk mc ('94-'98 V6?) work with a disk/drum setup with a proportion valve?

Thanks again

 

[trbkrb]

I know several guys have used his "plans" with their installs and I haven't heard about any problems. He says the screws are rather hard to find, but not expensive. He bought some in bulk a while back and was selling them to friends for their installs.

As for the 94-98 MC, yes it will work. I swapped my MC first to a new 94-95 MC, since my old MC went out several months before I swapped to 5 lugs and SN95 front, Mark VII rear brakes. It worked OK, but the pedal was a bit harder than with the stock Fox MC. And yes, the larger the MC bore, the harder the pedal effort is. A 94-95 Cobra unit would give you a softer pedal than the V6-GT unit.

 

[Stangboy67]

Thanks!

I appreciate the help!