![]() |
![]() |
#1 |
Registered User
Join Date: Oct 2005
Location: Pittsburgh, Pa
Posts: 106
|
proportioning valve
I am about to install a new generic prop. valve in my 80 GMC. It has rear drums and front discs. Trouble is, I saw someone mention that, whenever the disc brakes are bled you have to compress the rubber cap on the end of the valve. I don't seem to be able to compress this end part . It doesn't seem to budge. Does anyone know anything about this???? Thanks for any info. you can give me on this.
marvxyz1 |
![]() |
![]() |
![]() |
#2 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
|
Re: proportioning valve
The way I understand, The only time you have to push the pin on the valve is if you don't get any brake fluid through the front or rear bleeders. Pushing the pin re-centers the valve. Start bleeding at the R/R then L/R, R/F then L/F.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
Last edited by Restrorob; 03-18-2007 at 07:45 PM. |
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: Oct 2005
Location: Pittsburgh, Pa
Posts: 106
|
Re: proportioning valve
Thanks restorob, I've never replaced a prop valve, and I don't want to make any mistakes.. marvxyz1
|
![]() |
![]() |
![]() |
#4 |
Registered User
Join Date: Dec 2005
Location: tenn.
Posts: 84
|
Re: proportioning valve
Subscribing to tread, I am in the middle of a complete front brake overhaul and have run into the same thing. I only get fluid to the left front caliper. By the way, I have replaced mc(bench bled) front calipers, and rotors.
|
![]() |
![]() |
![]() |
#5 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
|
Re: proportioning valve
You may have a internal collapse in the right hose restricting fluid flow, The proportioning valve determines the amount of fluid sent to the rear verses front.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Dec 2005
Location: tenn.
Posts: 84
|
Re: proportioning valve
Are you talking about the hard line at the back of the master cylinder or somewhere towards the back of the truck?
|
![]() |
![]() |
![]() |
#7 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
|
Re: proportioning valve
OK, I miss read your post. You are not getting any fluid from the other three bleeders correct ? If so you need to check the proportioning valve to see if it's centered, And my other post could apply for no fluid to the R/F.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
|
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Dec 2005
Location: tenn.
Posts: 84
|
Re: proportioning valve
ok, I will try to center the valve, from what I have read, It seems the best way to do that is with a piece of wood wedged between the frame and the valve. Do you know a better way? Thanks for the help
|
![]() |
![]() |
![]() |
#9 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
|
Re: proportioning valve
I have just simulated slamming on brakes a few times (hit the pedal hard) and had them re-center them selfs. I have also had to remove the brake warning switch and use a pick to center them.
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
|
![]() |
![]() |
![]() |
#10 |
Registered User
Join Date: Dec 2005
Location: tenn.
Posts: 84
|
Re: proportioning valve
I put a c clamp on the prop valve to center it. I now get fluid to the rear and the right front. Thanks for the help.
|
![]() |
![]() |
![]() |
#11 |
The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
|
Re: proportioning valve
![]()
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! ![]() The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
|
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Dec 2005
Location: tenn.
Posts: 84
|
Re: proportioning valve
Should I leave the clamp on the valve during the bleeding process or remove it then bleed the brakes? I have been pulling alot of fluid through the rear, but I still have lots of air in the lines.
|
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|