Hey all I was wondering if i need a porportining valve on my 1950 ford truck. I have disk brakes on all corners. I have went the explorer 8.8'' rear and the mustang ii route with granada big rotors and chev calipers in the front I had bought a bracket from welders series in ontario to do such a thing.. Any help please..
sean

 

I depends on what master cylinder you're using, but yes, you'll probably need one. These guys can probably help you: ECI Hot Rod Brakes and Brackets Brake Facts

Dan

 

When Ford went to dual master cylinder in 1967, every vehicle came with a proportioning valve. With disc brakes, you need one.

 

sorry I have the 78 mustang ii brake booster and i did grab the porportning valve from this but what are the two electric wires for? and could i use this?
thanks sean

 

Is the proportioning valve just something that resembles a splitter? We have a '67 fairlane and it came with the dual master, and the two lines go to a splitter setup with all kinds of ins and outs.

 

See if you can get a look at a Mustang II schematic. I think the connector is probably for the brake warning light. If the pressure is different between the two sides of the master cylinder, the pressure switch will turn the brake light "ON" on the instrument panel. That'd happen if you lost fluid in either of the brake systems (front or back).

 

Two wires on top? Between 2 of your lines? Brake warning light switch?

 

yes the valve looks simalar to a tv splitter with 2 electric wires on it. I do not have a wiring diagram for this and it does not look like it is adjustable it prob. is factory preset do you think i should try it and dont worry about the two electric wires mabie snip these off ?
thanks sean

 

1967 Fairlane's w/discs have a (FoMoCo terminology) Brake Differential Proportioning Valve: C7OZ2B257D and a Front Disc Brake Pressure Control Valve: C7OZ2B091B that mounts on the rear axle.

1967 Fairlane's with drum brakes have a Brake Differential Proportioning Valve only: C7OZ2B257C
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D9BZ2B257B .. Brake Differential Proportioning Valve.

Fits: 1973 Mustang/Cougar / 1974 Mustang II / 1973/80 Pinto/Bobcat S/W (discs only-1973) / 1978/79 Fairmont/Zephyr except S/W.
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D5ZZ2B257A .. Brake Differential Proportioning Valve.

Fits: 1975 Mustang II / 1975 Pinto/Bobcat except S/W.
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D9FZ2B257A .. Brake Differential Proportioning Valve.

Fits: 1976/78 Mustang II / 1976/80 Pinto/Bobcat except S/W.

The only wires used with these valves are for the plastic low brake fluid warning light switch that threads into the brass valve. There is more than one type, 1967 is 1967 only.

 

thanks men i think you have answerd all my questions
thanks sean

 

Perhaps, but there's still a few questions I don't have answered, and I think they may be material to your needs.

First, you never said what master cylinder you're using. You said you have the MII booster, but you didn't mention m/c. If you're planning to use the MII m/c with 4 wheel disc brakes, think again. It won't work. You need one made for use with 4 wheel disc brakes. One for an 84-6 SVO Mustang should work for you. And it needs to be one from an SVO Mustang. It came with 4 wheel discs.

You also didn't say if you're using the master and booster on the firewall or under the floor. You will need a 2lb residual pressure valve in your lines if you're under floor. You don't need to use the factory valve with the wires on it. That is a switch for the brake warning light. So unless you're planning to wire one into your dash, that assembly is worthless. Especially since it's designed for disc/drum and you have disc/disc. Using that in your application is a sure way to mess yourself up. Personally, I'd ditch that entire setup and go with a Wilwood pressure control valve in the rear brake line, so you can adjust your own proportioning for your exact application.

Having properly working brakes is the most important system in any vehicle. They are not difficult, but you really need to know what you're doing so as to not mix and match the wrong parts. It's not the place to go cheap.

 

Thank you for clearing that up. I am almost 100% sure that the car came with front drum brakes.

Does that mean the the splitter/proportion valve is ok for my '56 with all drums?