I did the same mod to my 66 and had problems fitting a switch in there. I used a 70 switch from an automatic car and it works fine. That said you could use a pressure switch installed directly to your master cylinder.

Steve,

I did read the instructions. Is the 67-70 Mustang switch shorter as well as requiring less pressure to activate?

The later switches are physically the same size. A dent in the steering column tube will usually allow clearance. Also you may be able to loosen the booster stud nuts and pull upwards on the booster for a little extra room .

Rather than starting a new thread I might as well piggy back on this one.  I installed my brake light switch on my pedal (MS pedal and booster) and everything went together fine, but when I press the brake pedal in, the switch rotates up towards the pedal and the top contact on the switch hits the pedal.  I don't have any wiring in the car yet, so I am wondering is this normal without the wires connected or do I have something installed incorrectly?

Here are some pics.  The first one is after installing the switch, as you can see it is nice and level.  The second one is after pressing the pedal down, you can see how it's rotated up.  And the third pic is with the pedal pushed in. 

Last edited by Chaplin (2/09/2017 9:27 PM)

Thanks, I looked at that diagram when I put it together and I think I've got it set up correctly. 

I assembled in the following order:

1. White nylon washer on post
2. Brake switch
3. Plastic Bushing in rod from booster, then pushed that into the switch and pushed the hole assembly onto the post on the pedal.
4. Another white nylon washer
5. Hitch pin

Thanks, Steve.  I'll pick up a switch for a Fox and see if that works.

Very cool I'm glad this came up since I'm about ready to button up my MS booster and pedal upgrade. Looks like I'll maybe have to order a fox switch when I pick up my rear brake cylinders from napa.

Chaplin; Part numbers??

Oh, that looks sweet. I still run the old switch on my 67 and it's getting worn out. The NAPA part looks good.
Paul

Last edited by Prof (2/14/2017 12:42 PM)

67StangMan wrote:

Did anyone notice the brake switch in Chaplin's pictures is mounted 180 degrees out?  Notice one of the connection tabs is touching the brake pedal.  The switch needs to mounted so the connection tabs are pointing away from the pedal. 

 
Very true I just noticed that as well after being mentioned.

Chaplin wrote:

Well, I noticed it! 

But here's the thing, the switch in my pic is a '65 switch and it is installed exactly as is pictured in the diagram that MS posted.  So, the question is, is the diagram, which appears to be the same one that is in my factory service manual, wrong?  If the switch is flipped 180 so the contacts face away from the pedal, that puts the open horseshoe shaped part of the switch on the outside of the post, which is not what is shown in the diagram.

 
Your switch orientation is correct. Whole it COULD be installed "180 out" if you wanted, it would be very difficult to install in that manner, working under the dash.