Proportioning Valve. Do I have the Correct One? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

myoldchevytruck · 05-01-2008, 10:14 PM

I have done a swap from 6 lug Drums to 5 disk brakes in the front/6 lug drums to 5 lug drums in the back. My truck is a 69' with power brakes. Do I need to change the Proportioning Valve or am I okay with my current setup? Thanks, Harry

Update: Seems I may have to change the Master Cylinder also.

myoldchevytruck · 05-01-2008, 10:30 PM

ttt

cdowns · 05-01-2008, 10:35 PM

you need to change the prop valve to one from a disc brake truck because the residual pressure values are different fot discs and drums

myoldchevytruck · 05-01-2008, 10:53 PM

does the year of the truck matter? Looks like 71-87 would work. How about a later year? (tons of later models in the bone yard) What about the master cylinder. Whatever truck I get the Prop. Valve from' can I use the same master cylinder? Thanks, Harry

**steelhorse** · 05-01-2008, 11:36 PM

I believe you need the master cyl and prop valve.Not sure what years will fit,someone will chime in with that info soon.

05-01-2008, 10:14 PM	#1
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Proportioning Valve. Do I have the Correct One? I have done a swap from 6 lug Drums to 5 disk brakes in the front/6 lug drums to 5 lug drums in the back. My truck is a 69' with power brakes. Do I need to change the Proportioning Valve or am I okay with my current setup? Thanks, Harry Update: Seems I may have to change the Master Cylinder also. __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors Last edited by myoldchevytruck; 05-01-2008 at 10:30 PM. Reason: add text

05-01-2008, 10:30 PM	#2
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Re: Proportioning Valve. Do I have the Correct One? ttt __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

05-01-2008, 10:35 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Proportioning Valve. Do I have the Correct One? you need to change the prop valve to one from a disc brake truck because the residual pressure values are different fot discs and drums __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

05-01-2008, 10:53 PM	#4
myoldchevytruck Retired Air Force Veteran Join Date: Aug 2007 Location: Pembroke Pines, Florida 33024 Posts: 1,808	Re: Proportioning Valve. Do I have the Correct One? does the year of the truck matter? Looks like 71-87 would work. How about a later year? (tons of later models in the bone yard) What about the master cylinder. Whatever truck I get the Prop. Valve from' can I use the same master cylinder? Thanks, Harry __________________ Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors

05-01-2008, 11:36 PM	#5
steelhorse Senior Member Join Date: Apr 2008 Location: Franklinton NC Posts: 1,309	Re: Proportioning Valve. Do I have the Correct One? I believe you need the master cyl and prop valve.Not sure what years will fit,someone will chime in with that info soon.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.