What brake line do you connect the proportioning valve to

[Guest Anonymous]

I have this JYZ bias brake adjusting proportional valve with what appears to be 1/8 inch female threaded inlet and outlet for brake lines. Do I connect it to the front brake line or the rear brake line????? Doing early model 4x4 Toyota calipers to 280 Z rotars with 280 2+2 brake vaccum and master cylinder.How do you flare brake lines? I have this plumbing flaring tool and clamp set up; will it work?? Shooting in the dark on this one!!!

[Mike C]

Typically the rear. You want maximum braking in the front and adjust the bias to the rear so that they don't lock up. The weight shifts to the front during hard braking so not as much force is needed at ther rear.

[Guest Anonymous]

Can I use a plumbers flaring tool kit to flare brake lines for a brake bias adjuster???

[v8zed]

Hey ,

You need a double flairing tool to do brake lines. Most plumbing tools are a single flair. Craftsman has a double flair tool for about $40.00 that will do the job. It is wise to practice on a few scrap pieces of line before doing the on on the car so you don't have to shorten on up due to a mistake. These things take a bit of patience to work with.

Good Luck

Dennis

[Guest scca]

if you have never done double flaring before have someone else do it if the lines are on the car. its WAY easier in a vise than holding the tool to do a line ON the car..

i run about 80% success onlines on car still ... sometimes it just goes off center.

[pparaska]

The crappy double flaring tool that everyone sells (Eastwood, Jegs, Summit, etc.) in the red plastic box is very unreliable for getting an on center flare.

 

There are better tools for this that hold the mandrel centered in the tubing, but they are generally $150+

 

I just bought custom length lines that were already flared from classic tubes and was done with it!