stuck proportioning valve
Thread Starter
Le Mans Master
Joined: Oct 2010
Posts: 6,930
Likes: 842
From: melbourne florida
2023 C3 of the Year Finalist - Modified
stuck proportioning valve
my proportioning valve on my 79 seems stuck is it better to replace it or is there a way to free it up?
Instructor
Joined: Jan 2011
Posts: 146
Likes: 2
From: Hillsborough NC
See the following sticky thread and take a look at the instructions from tom454 about recentering it. Hopefully this will be of some help.
http://forums.corvetteforum.com/c3-t...fo-please.html
http://forums.corvetteforum.com/c3-t...fo-please.html
Thread Starter
Le Mans Master
Joined: Oct 2010
Posts: 6,930
Likes: 842
From: melbourne florida
2023 C3 of the Year Finalist - Modified
the problem seems to be the drivers rear caliper wont bleed even stomping on the pedal. am i missing something? is there a way to clean this thing on the car
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
If the passenger side will bleed, then it's not the combo valve.
If the dash brake lite is on, then it is the valve and the valve needs to be centered.
If there is sludge in the valve it will probably be stuck.
The only way to clean the valve is to remove it and then remove the proportioning valve from the pressure differential valve. You can then blow out the piston with some air and clean.
You should be able to center the piston by tightening the rear bleeders and loosening a front bleeder and pressing the pedal.
If the dash brake lite is on, then it is the valve and the valve needs to be centered.
If there is sludge in the valve it will probably be stuck.
The only way to clean the valve is to remove it and then remove the proportioning valve from the pressure differential valve. You can then blow out the piston with some air and clean.
You should be able to center the piston by tightening the rear bleeders and loosening a front bleeder and pressing the pedal.
Intermediate
Joined: Jan 2009
Posts: 26
Likes: 1
From: franksville wi
Its not the valve, its the rear hose on the left side. Sounds like it may have collapsed, and is not letting fluid to the caliper. I would remove the the line (before the hose) and see if your getting fluid.
Thread Starter
Le Mans Master
Joined: Oct 2010
Posts: 6,930
Likes: 842
From: melbourne florida
2023 C3 of the Year Finalist - Modified
