When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Just curious if anyone knows the original location of the proportioning valve on the 1969 F100 with the 360fe? Mine is located on the drivers side behind the engine on the inside of the frame rail. I am (possibly) wanting to replace all of the brake lines with pre-bent line from Dennis Carpenters and want to be sure that those pre bent lines will fit. Also, I have some what of a predicament to figure out. When I bought my truck the guy before the guy had swapped out the original front drums for disc brakes from a donor 78/79 F100 truck. If I want to buy pre-bent brake lines for the front should I get the pre-bent lines for a 1969 F100 or get the lines for a 78/79 F100 truck or by a kit to make my own?
That's not a proportioning valve.Drum brakes don't need them. That is the brake warning lamp circuit switch. I can't think of the proper name for it right this second. If you do a disc brake conversion then you will need to swap this out for a proportioning valve. See https://www.ford-trucks.com/forums/1...mpilation.html it's got a lot of good stuff in it.
The front brake hoses are different for sure, but I don't know it your PO (Previous Owner) changed out the metal hard lines our not. It would be a very good idea to buy new lines. My 69 F250 blew the metal line that goes to the rear brakes the day before I was set to drive about 400 miles to my new house location- had to rent a car carrier-. Do a search for "Ultraranger"s disk brake swap in our Forum.
That's not a proportioning valve.Drum brakes don't need them. That is the brake warning lamp circuit switch. I can't think of the proper name for it right this second. If you do a disc brake conversion then you will need to swap this out for a proportioning valve. See https://www.ford-trucks.com/forums/1...mpilation.html it's got a lot of good stuff in it.
Then why is it possible to buy a prop valve specifically made for disc/drum applications?
Drum/drum brake systems from 1967-up use pressure differential valves. All-wheel drums don't use proportioning. Your pressure differential valve is in its stock location but, it looks to me someone has done some 'plumbing' work of running some brake lines to the valve.
Pressure differential valve cutaway view.
Disc/drum brake setups use a combination of dissimilar brake types (discs on front, drums on rear). These two systems don't react the same to the application of the brake pedal and need a means of valving controls to make them respond correctly.
No '67-'72 F100 came with factory front discs. '68-'72 F250/F350 was available with optional factory front discs.
Beginning in '73 though, all F100 through F350 trucks came standard with factory front discs. These trucks used a disc/drum brake valve that had 3 internal functions: Metering (hold-off) to the front discs, pressure differential sensing between the front and rear brake circuit and proportioning to the rear drums.
Kelsey-Hayes cast iron disc/drum brake valve for trucks under 6900# GVW.
Weatherhead brass disc/drum brake valve for trucks with a GVW of 6900# or greater.
Your absolutely correct ultraranger in that someone did in fact do some "plumbing work". So, does this mean I need to change the pressure differential valve to a proportioning valve specific to disc/drum applications?
Thank you in advance for your help by the way. I seem to be spending a lot of extra time these days trying to diagnose what the previous owners have done so I can bring the truck back to it's original state. What a pain in the rear it has been too!
If your F100 has front discs on it, they were added but, evidently, the person doing the front disc conversion did not also change out the brake valve. If you want the brakes to respond correctly, you would need to change the drum/drum pressure differential valve to a valve specific to a truck with discs front/drums rear.
Since this would be a deviation away from what was OEM to your truck, there aren't going to be any pre-fabbed brake lines, off-The-shelf, that are going to fit your application if parts are being changed up --not all of the fittings may be the right size on pre-fabbed lines either. The best solution is to simply fab your own brake lines, since you can route them however you need to, to connect to the components wherever you may mount them.
This is a thread showing the '82 F100/F150 disc/drum brake valve I installed on a friend's '72 F100, when I converted his truck over to front discs. It also shows the valve mounting bracket I had made and the brake lines I fabricated to connect between the components.
okay, so I'm guessing that I will be making my own brake lines now. Any recommendations on tubing and size? I've found the copper/nickel tubing in 3/16 and 1/4 sizes in a kit with fittings, and also the stainless steel brake lines tubing with fittings in a kit? They both come in 25' rolls which should be enough to do the truck. And these should be double flared correct?
Also, any recommendations on which proportioning valve to use? Obviously it will be disc/drum, I was thinking of mounting it to the right side of the m/c and then just running new lines to it.
okay, so I'm guessing that I will be making my own brake lines now. Any recommendations on tubing and size? I've found the copper/nickel tubing in 3/16 and 1/4 sizes in a kit with fittings, and also the stainless steel brake lines tubing with fittings in a kit? They both come in 25' rolls which should be enough to do the truck. And these should be double flared correct?
The hard lines should be run in 3/16" diameter tubing. Stainless steel looks nice but is difficult to double flare if you don't have good flaring tools.
Working with coiled tubing can be a pain trying to get it to straighten out. I made a tool for that (details in the following link).
I'm looking to do this to my 72, my question is do I have to remove the differential valve or can I leave it and fit a proportional valve elsewhere in the system?
<div style="text-align:left;">I'm looking to do this to my 72, my question is do I have to remove the differential valve or can I leave it and fit a proportional valve elsewhere in the system?</div>
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
