66 drum to disc questions

COBRAGT3501966 said:

got a 66 fastback, gonna convert front drum to disc.
Here is the set up, pretty simple.
Single large bowl disc master ( manual)
K/H 4 piston calipers, stock rotors, hoses etc...
I am alittle confused on what combination valve to use, so QUESTION:
What do I need to run combonation valve or dist block?
Let me know what you think.
Thanks !!!

Click to expand...

Finished a drum to disc setup in my '66 last year.

The single bowl will work, but most people here will recommend the dual bowl for safety reasons (unless your concourse).

The distribution block is different from the drum block. Although they look alike, the disc has only 3-ports while the drum 4-ports. You will need one of these and they do make aftermarket ones.

Proportioning valve. Either find an original useable K/H one or buy an after market (easy to adjust) one. You will also need one of these.

I just received the SSBC (Stainless steel Brake Corp) new combination valve. It is a proportioning valve and distribution valve all in one and is adjustable. Also comes with a brake light switch installed. I also used an 84 mustang svo MC. Its a direct bolt on but the ports come out the passenger side so I had to fab a couple lines. Also the ports are bigger but the parts house had the adapters on hand to reduce them down to 3/16 line. It might not be neccesary to reduce them if you use the affore mentioned SSBC valve because it comes with all kinds of adapters. On the rear I'm using caddy calipers and lincoln 11" rotors. The caddy calipers have parking brake built in. I got the bolt on brackets for the calipers on eBay for 60.00

COBRAGT3501966 said:

got a 66 fastback, gonna convert front drum to disc.
Here is the set up, pretty simple.
Single large bowl disc master ( manual)
K/H 4 piston calipers, stock rotors, hoses etc...
I am alittle confused on what combination valve to use, so QUESTION:
What do I need to run combonation valve or dist block?
Let me know what you think.
Thanks !!!

Click to expand...

For MC, I would recommend a dual reservoir from a 75 Granada with front discs (and drum rear.) Use your 66' pedal to MC rod. This is a safer combo, practically a bolt in, and is cheaper in the long run because the MC is very common. You would need to make or buy a couple of lines.

You can use a stock Jelly Jar if you wish. Note that it has 2 ports for brake lines--this distinction is important because you will need to separate the front and rear brake lines regardless of MC used.

The K/H disc brakes you mentioned use a distribution b--which in the case of a 65/66 is basically a T fitting. It doesn't change pressure nor have any sensors. The T allows you to connect to the 2 front brakes from a single MC output. You could use a hardware store T, track down an original 3 port distribution block for early disc brakes, OR you can use your original 4 port by blocking off one port. Since you need to separate the rear brakes from the front anyways, just remove the rear line and plug the port that the line came from.

The rear drum brakes require a proportioning valve, just like most drum brakes. A line needs to exit the MC and be plumbed into the valve. As mentioned a stock K/H valve or an easy to get and often cheaper aftermarket one will work just fine. A single line exits the proportioning valve and leads to the rear axle. This line will work fine for you conversion.