1991 Ford super duty rear parking brake help

[challenger]

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My 1991 Ford super duty (450) is missing the parking brake cables. I'm looking for a diagram for the routing. It appears that it goes to what appears to be so sort of hydraulic locking system that is attached to the rear end

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[79jasper]

It doesn't have rear parking brakes....
It's on the back of the transmission. "Driveline brake."

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[sjwelds]

Jasper nailed it. An f-superduty only thing.

I do wonder what the gizmo in the pics is tho.

 

[79jasper]

Pics haven't been loading on my end, wasn't able to view it. I'll try the web.
Okay, back.
Well for starters, parking brakes are never hydraulic.
That is a load sensing proportioning(?) Valve. The higher the load, the more braking power.
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[Thewespaul]

That’s correct, ford had to add that on to keep dot happy because those trucks didn’t have rabs.

 

[ttman4]

That is a load sensing proportioning(?) Valve. The higher the load, the more braking power

In pic that is what activates the proportioning valve?? As I understand my proportionong valve is mounted on frame under dr seat ('90 CC Dually). I need to crawl & look under rear later today.

Reason I ask/wonder is cause several yr ago I did 3" frame lift, never had same braking as before. Thing stops but not same. Now with my D60 front disc when I stop fast/hard I got lots more braking in front than rear. Even with new shoes & pads.
Maybe I need to readjust some linkage to compensate for my 3" lift??

I'm still learning stuff.....

 

[Thewespaul]

In pic that is what activates the proportioning valve?? As I understand my proportionong valve is mounted on frame under dr seat ('90 CC Dually). I need to crawl & look under rear later today.

Reason I ask/wonder is cause several yr ago I did 3" frame lift, never had same braking as before. Thing stops but not same. Now with my D60 front disc when I stop fast/hard I got lots more braking in front than rear. Even with new shoes & pads.
Maybe I need to readjust some linkage to compensate for my 3" lift??

I'm still learning stuff.....

This was only on the Dana 80 F-superduty trucks. The regular chassis trucks have a regular setup with rabs, the F-superduty trucks don’t have the mess of joiners and rabs valves on the frame.

 

[snicklas]

The pre-RABS trucks also have the axle mounted valve. The 83-86 Bullnose trucks are that way.

 

[79jasper]

I'm still learning stuff.....

Would behoove you to browse through many of our brake threads. Learn the terminology, and component I.D.

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[austin92]

The pre-RABS trucks also have the axle mounted valve. The 83-86 Bullnose trucks are that way.

My 83 doesn’t, maybe that’s part of my rear brakes being grabby issue lol


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[challenger]

It doesn't have rear parking brakes....
It's on the back of the transmission. "Driveline brake."

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Okay thanks. Do you know where I might find a diagram of the set up.

 

[challenger]

I crawled under the truck and the driveline braking system is missing. I recalled 2 years ago when I bought it that the other owner replaced the transmission so the whole assembly is gone. Thinking of a micro lock

 

[79jasper]

Like a line lock?

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[Oledirtypearl86]

This was only on the Dana 80 F-superduty trucks. The regular chassis trucks have a regular setup with rabs, the F-superduty trucks don’t have the mess of joiners and rabs valves on the frame.

My 86 F350 has that proportioning valve think and i was cirious what it was but suspected it was for brakeing when loaded