differential pressure valve?
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Senior User
Joined: Jun 2003
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From: Kannapolis NC
differential pressure valve?
I have on my truck a DP valve which I have id to have come from a 75-79 f150. It has been inactivee for a number of years and open to the air. Now that I am putting the brake system back in operation I find the valve will let no fluid to the rear wheels and I suspect the valve is rusted inside and I think this is a ball on a spring which has frozen in place, But I am just guessing. Is this correct? and Can I disassemble it and free up the inner works or just bite the bullet and buy another.? Thanks
Cargo Master
Joined: Feb 2008
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From: Windermere Valley,B.C. Ca
What? 
If this is around a 1980 that would be to early for anti-lock brakes wouldn’t, and if so they would have to work with the front brakes and a controller? So what is this thing? I think (?) it might be a superficial item or should that read a sacrificial item. 
If this is around a 1980 that would be to early for anti-lock brakes wouldn’t, and if so they would have to work with the front brakes and a controller? So what is this thing? I think (?) it might be a superficial item or should that read a sacrificial item.
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Senior User
Joined: Jun 2003
Posts: 285
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From: Kannapolis NC
The valve is there because the front end has been replaced with a torsion bar (labaron) frontend which has disc brakes on the front and drums on the rear, thus the need for the Differential valve.
Post Fiend
Joined: Jun 2001
Posts: 7,493
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From: Erie, pa
If the valve is not adjustabe it would be a 10PSI residual valve there should also be one for the front at 2PSI.
The adjustable valve is optional and is a Bias or proportional valve.
It's brakes - which means lives - which = replacement.
The adjustable valve is optional and is a Bias or proportional valve.
It's brakes - which means lives - which = replacement.
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