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Old 06-08-2004, 01:36 AM   #1
1972C10
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85 ScottsDale 20 Rear Brake Prop Valve ??

Does Anyone Else have This? Or is it an option on a heavy duty jb6 brake system I think thats the number my brake system is the best one WIth the cast Iron master Cylinder And One Ton Rear Shoes
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Old 06-08-2004, 01:37 AM   #2
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O yeah i think this valve give it more or less rear brake the more its loaded
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Old 06-09-2004, 01:58 AM   #3
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Correct. They commonly go bad too so if you have brake problems, bypass it. They never worked that well anyways.
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Old 06-09-2004, 09:57 AM   #4
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My 88 3/4 ton burb has one. Seem to function on my 88. You correct, it put a little more brake to the rear as load causes the rear to drop.

When I have my Cargo trailer and a load in the burb I do notice a change in the brakes. I had a brake pull from a stuck adjuster in the rear that became VERY apparent with load but hardly noticed it empty.
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Old 06-09-2004, 08:18 PM   #5
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Yeah my rear shoes are super thick and i just put new carbon metalic and rotors on the front it stops good the pedal just goes down more than i think it should

Did you bypass yours? It has a prop valve up front too Im just wondering why it has this and what if the other prop valve puts 100% to the back and this second one is supposed to do the rest.
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