Bypass and remove the "height sensing" proportioning valve?

[wczimmerman]

Hello everyone,

I was out doing some rear axle maintenance today and noticed that the rear proportioning valve was wet. So, I moved the linkage and quickly got drips from the valve itself (not the lines going into it). This part has obviously failed. Nobody has a replacement and I've read that GM had a TSB for the 1 ton Suburbans/trucks to simply remove the part. My question is this: is it possible to just remove the lines and add some sort of connection between them in its place without cutting the existing lines? My truck is a V2500 3/4 ton 4x4 Suburban.

Thanks!

 

[skysurfer]

chengny put up some info in post #5:
http://www.gmsquarebody.com/forum/showthread.php?t=5984&highlight=lspv

Edit: just noticed that second link isn't working. Maybe @chengny could repost it here.

 

[Keith Seymore]

Absolutely.

It was a test beater put in place solely to pass FMVSS 108 in the days before ABS.

Get rid of the valve and all of the claptrap linkage.

K

 

[foamypirate]

You can easily bend the rear brake line off the frame rail and screw it into the rear brake hose. Just be careful and take your time not to kink it. No adapters or mods necessary.


EDIT:

Found a post I made previously on this:

http://www.gmsquarebody.com/forum/showpost.php?p=206876&postcount=1907

 

[wczimmerman]

Well, since I don't have the tools and time to fix this, I brought it to the mechanic that handled the motor swap for me. He's done great work but today he let me know that GM decided to make one of the lines 9/16" which is apparently a very odd size. The custom hydraulic line shop he uses didn't have anything to reduce it to the size of the other line (the main brake line from the master cylinder). So, at this point he's thinking of using 1/4" union from the main brake line and running about 3 ft of new brake line to the T connector in the back.


Here's a picture of the culprit:

You must be registered for see images

If I recall correctly, the line to the back T connector is on top and the main brake line from the master cylinder is on bottom.

Anyone have any other creative solutions?

 

[foamypirate]

No creative solution required! Check my post above. You literally just have to slightly bend the main line from the frame rail and it will screw right into the rear brake hose!

 

[wczimmerman]

No creative solution required! Check my post above. You literally just have to slightly bend the main line from the frame rail and it will screw right into the rear brake hose!

I did look at thay but, sadly, my V2500 setup is slightly different. The rear brake hose isn't mounted like yours. Take a look at the picture in my post and you'll see what I mean.

 

[foamypirate]

Ah, I'm at work so the photo is blocked. Bummer that won't work for ya.