Looking for a Brake Pressure Differential Valve - Page 2 - Ford Truck Enthusiasts Forums



1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Looking for a Brake Pressure Differential Valve

Reply
 
 
 
Thread Tools Search this Thread
  #16  
Old 12-05-2017, 10:03 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by TeachNlive4ever View Post
My truck is a 69. I do have a 78 laying around, but I dint think that will help you. I understand what Ultra is saying, but I donít need a light to tell me my brakes arenít right. Just saying...
Sorry. I really can't identify the newer trucks. Maybe I'll have one someday, and start this process over again. I used to have a 79 F250 and I wish I had never given it to my son. It had the 460 in it and would get 8-10 mpg going uphill or downhill, pulling a horse trailer or empty...

I rewired my entire 51 F4 from scratch, so I'm not afraid of wiring. But I don't know anything about the 67-72 ignition switch so it kind of puts me off the whole pressure differential valve idea. I wouldn't mind including it if I knew more about what I'd have to do. But I don't want to enlarge the hole in the dash if the ignition switch is bigger. Or if the switch wiring is totally different...

And I'm pretty sure I'd also know if half of the brakes weren't working, without a light, as you said.

I'm glad I started this thread, even though I've kinda talked myself out of it.
Reply With Quote
  #17  
Old 12-05-2017, 10:23 PM
TeachNlive4ever's Avatar
TeachNlive4ever TeachNlive4ever is offline
Posting Guru
 
Join Date: May 2015
Location: Garland, Tx
Posts: 2,227
TeachNlive4ever has a very good reputation on FTE.TeachNlive4ever has a very good reputation on FTE.TeachNlive4ever has a very good reputation on FTE.TeachNlive4ever has a very good reputation on FTE.
Often it just helps,to use people as a sounding board. Keep,us up to date on your jalopy
Reply With Quote
  #18  
Old 12-07-2017, 05:16 PM
NumberDummy's Avatar
NumberDummy NumberDummy is online now
Ford Parts Specialist
 
Join Date: Nov 2006
Location: Simi Valley, CA
Posts: 73,712
NumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputationNumberDummy has a superb reputation
Quote:
Originally Posted by Jolly Roger Joe View Post
Hey everyone! My first thread in this forum, but definitely not new to FTE.

Looking for a Brake Pressure Differential Valve part number: C8TZ 2B257-D for a 68-72 F250 2WD & F350 with 4 wheel drum brakes.
Fixed it for you, you omitted F350 and 1968/75 F250 4WD is different.
Reply With Quote
  #19  
Old 12-07-2017, 05:50 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by NumberDummy View Post
Fixed it for you, you omitted F350 and 1968/75 F250 4WD is different.
Thanks Bill.
Reply With Quote
  #20  
Old 12-07-2017, 05:56 PM
Wayford Wayford is offline
New User
 
Join Date: Dec 2017
Posts: 7
Wayford is starting off with a positive reputation.
Where would it be located? There is a '69 in the junkyard near me.
Reply With Quote
  #21  
Old 12-07-2017, 07:28 PM
351Cleveland C4's Avatar
351Cleveland C4 351Cleveland C4 is online now
Post Fiend
 
Join Date: Jul 2011
Location: On the Edge of the Desert
Posts: 7,165
351Cleveland C4 has a great reputation on FTE.351Cleveland C4 has a great reputation on FTE.351Cleveland C4 has a great reputation on FTE.351Cleveland C4 has a great reputation on FTE.351Cleveland C4 has a great reputation on FTE.
I will have mine off as soon as I do my disc swap. Although I'm pretty sure it's stuck to one side so it would have to be taken apart and reset.

Have you considered a universal one? Maybe even an adjustable unit?
Reply With Quote
  #22  
Old 12-07-2017, 08:44 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by Wayford View Post
Where would it be located? There is a '69 in the junkyard near me.
I'm just guessing here as I don't currently have one in my truck (65 F250). But I believe it will be right below the master cylinder, as both front and rear brake lines feed into it from the m/c.
Reply With Quote
  #23  
Old 12-07-2017, 08:49 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by 351Cleveland C4 View Post
I will have mine off as soon as I do my disc swap. Although I'm pretty sure it's stuck to one side so it would have to be taken apart and reset.

Have you considered a universal one? Maybe even an adjustable unit?
Thanks Garrett.

To tell the truth, I never heard of the pressure differential valve until Steve mentioned it is part of the system on 67-72 trucks with 4 wheel drum brakes.

It's not a proportioning valve, which would be adjustable. It's to provide a visual warning (light) if there's a pressure difference between the two ports. And I've already got the rebuild kit info from Steve and another nice contributor on here.

PM me with what you want for the one you're removing from your truck. I can rebuild it.
Reply With Quote
  #24  
Old 12-07-2017, 10:16 PM
Wayford Wayford is offline
New User
 
Join Date: Dec 2017
Posts: 7
Wayford is starting off with a positive reputation.
Quote:
Originally Posted by Jolly Roger Joe View Post
I'm just guessing here as I don't currently have one in my truck (65 F250). But I believe it will be right below the master cylinder, as both front and rear brake lines feed into it from the m/c.
ok.. ill take a look. I'll be there tomorrow.
Reply With Quote
  #25  
Old 12-07-2017, 10:18 PM
ultraranger's Avatar
ultraranger ultraranger is offline
Post Fiend
 
Join Date: Apr 2011
Location: Camden, Arkansas
Posts: 5,832
ultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to behold
Quote:
Originally Posted by Jolly Roger Joe View Post
I'm just guessing here as I don't currently have one in my truck (65 F250). But I believe it will be right below the master cylinder, as both front and rear brake lines feed into it from the m/c.
The PDV on a Bumpside will be located inside the left frame rail, just behind the steering gear box.

Reply With Quote
  #26  
Old 12-07-2017, 10:57 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by ultraranger View Post
The PDV on a Bumpside will be located inside the left frame rail, just behind the steering gear box.
Steve, I know you gave me a link to the wiring diagram for the Prove Out circuit, but now I can't find it. And I know you said it's wired into the ignition switch and that it checks the circuit with the key "ON". What I don't understand is how that works. Can you enlighten me?

I'm trying to figure out how to make this work (if possible) on my truck without changing the ignition switch.
Reply With Quote
  #27  
Old 12-08-2017, 11:20 AM
ultraranger's Avatar
ultraranger ultraranger is offline
Post Fiend
 
Join Date: Apr 2011
Location: Camden, Arkansas
Posts: 5,832
ultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to behold
Quote:
Originally Posted by Jolly Roger Joe View Post
Thanks Garrett.

To tell the truth, I never heard of the pressure differential valve until Steve mentioned it is part of the system on 67-72 trucks with 4 wheel drum brakes.

It's not a proportioning valve, which would be adjustable. It's to provide a visual warning (light) if there's a pressure difference between the two ports.
The only adjustable proportioning valve (stand-alone Kelsey-Hayes) from the factory, that I know of, was on the '65-'67 Mustangs with factory front discs. Outside of this, I don't know of any OEM Ford disc/drum brake valves that have any adjustment means on the proportioning circuit of the valve assembly.

Outside of this, the only adjustable means would be with an aftermarket manually-adjustable proportioning valve --but, 4-wheel drums don't need proportioning so, that doesn't apply in this case.
Reply With Quote
  #28  
Old 12-08-2017, 11:24 AM
ultraranger's Avatar
ultraranger ultraranger is offline
Post Fiend
 
Join Date: Apr 2011
Location: Camden, Arkansas
Posts: 5,832
ultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to beholdultraranger is a splendid one to behold
Reply With Quote
  #29  
Old 12-08-2017, 12:28 PM
Jolly Roger Joe's Avatar
Jolly Roger Joe Jolly Roger Joe is offline
Just another Joe
Thread Starter
 
Join Date: Jul 2011
Location: Rockingham, VA
Posts: 6,081
Jolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant futureJolly Roger Joe has a brilliant future
Quote:
Originally Posted by ultraranger View Post
The only adjustable proportioning valve (stand-alone Kelsey-Hayes) from the factory, that I know of, was on the '65-'67 Mustangs with factory front discs. Outside of this, I don't know of any OEM Ford disc/drum brake valves that have any adjustment means on the proportioning circuit of the valve assembly.

Outside of this, the only adjustable means would be with an aftermarket manually-adjustable proportioning valve --but, 4-wheel drums don't need proportioning so, that doesn't apply in this case.
The only proportioning valve I've ever dealt with was part of the aftermarket disc brake kit I installed on a friend's 65 Mustang to replace the front drum brakes. It required adjustment after installation, so I made the false assumption that all proportioning valves are adjustable.
Reply With Quote
  #30  
Old 12-08-2017, 01:01 PM
Rasputin53's Avatar
Rasputin53 Rasputin53 is offline
Elder User
 
Join Date: Mar 2013
Location: Garner NC
Posts: 836
Rasputin53 is gaining momentum as a positive member of FTE.Rasputin53 is gaining momentum as a positive member of FTE.
The only reason to use the diff-pressure valve (really just a switch) is to light a warning light on the dash and get ticked off every time you bleed the brakes because you have to re-center it. Honestly, I would not add one just because you are going with a dual MC. The proportioning valve is only necessary when you have a disc/drum setup. Drum/Drum does not need one. And the adjustable Mustang unit was 65/66 KH. In 67, they used a fixed cylindrical prop valve cleverly located at the rear axle up under the car. In 68/69, they made it mount to the same bracket as the diff-press. In 70 they made an integrated unit. I would just plumb direct. The diff-press switch does not buy you any performance in the braking system.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WTB 68-72 Brake Pressure Differential Valve Jolly Roger Joe WTB - Parts & other 1 12-04-2017 02:44 PM
centralizing brake pressure differential valve Oldbluer 1967 - 1972 F-100 & Larger F-Series Trucks 29 06-15-2017 06:35 PM
Combo Valve - resetting pressure differential switch Mikulh 1967 - 1972 F-100 & Larger F-Series Trucks 19 08-03-2016 05:52 PM
Brake proportion valve winklershop 1973 - 1979 F-100 & Larger F-Series Trucks 11 04-18-2016 12:22 AM
1969 f250 4wd break differential valve Hazmat6750 1967 - 1972 F-100 & Larger F-Series Trucks 1 02-24-2016 08:54 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 01:36 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.