Picture of Porportioning Valve setup - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70 GMC 4x4 · 04-02-2002, 11:54 AM

I am not sure if I have my porportioning valve hooked up correctly. I am considering that I may have the rear lines hooked up in the place of the front ones.
Any pictures would be great.

Thanks,
Tim

*Fast68Chevy* · 04-02-2002, 01:26 PM

rear line is 1/4" is larger than the front, theres no way,

the rear line goes out the rear of the combo valve unit

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Randy- Lincoln, IL
randy@ccaonline.com
-71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!very apart and not driveable still.....
-'84 Z28 H.O. 305 L69 700R4 GT4 3.73
- 1984 Firebird SE 2.8L T-5 GT4 3.73
-1981 Cutlass Supreme, dunno what im gonna do with it yet...
-79 G20 pass van, 350/th350/10bolt
*Paint is overrated
© RSS Enterprises 2000

Dean · 04-02-2002, 04:08 PM

If I remember correctly, the lines are backwards on a K20. Check the manual to be sure. I don't remember the lines being different size either.

**JIMs70GMC** · 04-02-2002, 08:00 PM

Hope's this helps:

[img]http://www.msnusers.com/_Secure/0LgDnDSsOqDM1pIoYIItK3iVBTBMKgYfDfqOwXv0l1bklv1gv*OBKrRgL*kcyb!MqpEeoH8NFTc0/Jan04_12.JPG[/img]

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1970 GMC K25 Custom
Chesapeake, VA
My 70 GMCor Webshots http://community.webshots.com/user/70gmc

70 GMC 4x4 · 04-02-2002, 08:34 PM

Thanks Jim,

My lines from the portioning valve to the master cylinder are different than yours, they are swapped, I have the back going to the front and the back going to the back. This could be the problem I am having with only one front side working right.

Thanks

04-02-2002, 11:54 AM	#1
70 GMC 4x4 Registered User Join Date: Apr 2001 Location: Marion, Iowa Posts: 126	Picture of Porportioning Valve setup I am not sure if I have my porportioning valve hooked up correctly. I am considering that I may have the rear lines hooked up in the place of the front ones. Any pictures would be great. Thanks, Tim __________________ 70 3/4 GMC 4x4, 400sb

04-02-2002, 08:00 PM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Hope's this helps: [img]http://www.msnusers.com/_Secure/0LgDnDSsOqDM1pIoYIItK3iVBTBMKgYfDfqOwXv0l1bklv1gvOBKrRgLkcyb!MqpEeoH8NFTc0/Jan04_12.JPG[/img] ------------------ 1970 GMC K25 Custom Chesapeake, VA My 70 GMCor Webshots http://community.webshots.com/user/70gmc __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

04-02-2002, 08:34 PM	#5
70 GMC 4x4 Registered User Join Date: Apr 2001 Location: Marion, Iowa Posts: 126	Thanks Jim, My lines from the portioning valve to the master cylinder are different than yours, they are swapped, I have the back going to the front and the back going to the back. This could be the problem I am having with only one front side working right. Thanks __________________ 70 3/4 GMC 4x4, 400sb

04-02-2002, 01:26 PM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	rear line is 1/4" is larger than the front, theres no way, the rear line goes out the rear of the combo valve unit ------------------ Randy- Lincoln, IL randy@ccaonline.com -71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!very apart and not driveable still..... -'84 Z28 H.O. 305 L69 700R4 GT4 3.73 - 1984 Firebird SE 2.8L T-5 GT4 3.73 -1981 Cutlass Supreme, dunno what im gonna do with it yet... -79 G20 pass van, 350/th350/10bolt *Paint is overrated © RSS Enterprises 2000

04-02-2002, 04:08 PM	#3
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	If I remember correctly, the lines are backwards on a K20. Check the manual to be sure. I don't remember the lines being different size either.



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