My question on putting a 1968-72 dual master cylinder in an older truck---how would I wire a brake light switch?? The 61-66s had the switch on the master cylinder but the later ones didn't. Or maybe I can put a 68-72 bracket and switch on the foot pedal ??

 

1967 F100/350 brake pedal & switch are 1967 only. The switch attaches to a hole in the pedal using two nylon bushings, special bolt and nut.

1968/72 F100/350 use a different brake pedal and switch. Pedal has a bracket made as part of it, threaded retainer (C8TZ-13A629-A) fits into hole on bracket, switch threads into retainer.

1973/77 F100/350 & 1978 F100/350 & Bronco before serial number CC0,001 use the same switch and retainer. But 1973/79 brake pedals aren't the same, because there are 22 different types!

 

You could put a tee fitting in one of the lines(between the m/c and any residual pressure valves/proportioning valve you might have installed)and just put the hydraulic switch there.

 

Here's my then-under construction '70 with an adjustable Wilwood PV with an integral brake light switch. The PV is about $80... I made my own bracket but Wilwood has since come out with its own for about $30.

 

Since on talk of 61-66 brake talk has anyone had experience with the single mc and brake booster that some places sell? Sorry if its alittle off topic but figured i ask since they keep the single mc and so assume the brake light switch would stay in place

 

I had converted a friend's '65 F100 from a single reservoir MC to a dual reservoir.

I took a 3/16" inverted flare Tee and used a small pipe tap, to tap the center port of the Tee, to screw the brake light pressure switch into.




On my '69 F100, I installed a modern MC for a '95 Ford Explorer. You'll notice that there's a 'rhino horn' sticking up on the front of the casting. There are two different version of this MC. One with cruise control and one without. One without CC came without the rhino horn drilled and tapped. The MC for CC will have the rhino horn drilled and tapped for a pressure switch.

You could take the Explorer MC, meant for CC, and install a brake light pressure switch in that port.




'95 Explorer MC w/CC pressure switch port.

BrakeBest Select NMC2696 - Master Cylinder | O'Reilly Auto Parts

 

If you are using a dual reservoir master cylinder with brake shoes on all 4 wheels and NOT disks, you can just put a tee in one of the brake lines. The switch uses pipe threads and the brake line uses SAE threads, but you can get the adapter at any NAPA auto parts store. Here is mine on my 62' F100.












62 F100 equal size dual bowl reservoir for drum brakes

 

So can I do a split master with power booster on my 66' now with drums and upgrade to disks later using that same setup?

 

Sorry, I can't answer that as I didn't use a brake booster, because from what I researched and people I talked to, told me with brake shoes, a booster doesn't give you that mush more stopping power. With a disc front brakes and shoe rear brakes, I think it takes a different master cylinder.

 

I'm putting a 67 dual master in my 66 very soon. I found a tee that has two flare fittings and one 1/8 npt for the brake light switch. I can use the original push rod right?

 

When I bought my '69 F100 4 years ago, it still had its 4-wheel drums with a manual brake MC.



I went through and rebuilt the drum brakes at all four corners and installed a new manual (tandem) MC.

About a year later, I installed a dual diaphragm brake booster from a '75 F350 but, I still had drums all the way around.



Back in October, I pitched the front drum suspension and installed a front disc brake suspension from a '77 F100.





I replaced my conventional cast iron MC and installed a new, 'modern' MC for a '95 Ford Explorer.



I replaced my stock '69 pressure differential brake valve for a disc/drum brake valve from an '84 Ford F150. My truck's brakes work exceedingly well now.

 

Here is the tee that you need if you want to put the switch inline:


No adapter needed, it worked out great for me.

 

1966 f100. 4 wheel drum truck.

When doing the conversion from a single bowl to a double bowl master, should the front bowl of the master be ported to the rear brakes?

I am using a 68 mustang 4 wheel drum brake master.

thanks

 

Yes, the larger reservoir closest to the firewall goes to the front brakes, and the smaller one towards the front goes to the rear brakes.

 

Thank you for the help. i try do do a lot of research before i ask questions. Great group of support here. Could not do this hobby without you.