85 ScottsDale 20 Rear Brake Prop Valve ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*1972C10* · 06-08-2004, 01:36 AM

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

*1972C10* · 06-08-2004, 01:37 AM

O yeah i think this valve give it more or less rear brake the more its loaded

apstguy · 06-09-2004, 01:58 AM

Correct. They commonly go bad too so if you have brake problems, bypass it. They never worked that well anyways.

Grim Reaper · 06-09-2004, 09:57 AM

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.

*1972C10* · 06-09-2004, 08:18 PM

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.

06-08-2004, 01:36 AM	#1
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	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

06-09-2004, 01:58 AM	#3
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	Correct. They commonly go bad too so if you have brake problems, bypass it. They never worked that well anyways. __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

06-09-2004, 09:57 AM	#4
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	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. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

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06-08-2004, 01:37 AM	#2
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	O yeah i think this valve give it more or less rear brake the more its loaded

06-09-2004, 08:18 PM	#5
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	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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