Is this normal for Stainless Steel braided brake lines?

[Guest remarcable]

I put on a set of goodridge ss brake lines along with some speed bleeders today. The kit was for a WRX and everything fit except for the speed bleeders in the rear - the 1999 outback has larger bleeder screws in the rear and the ones I was sent don't work.

 

I was expecting a radically changed brake behavior.. and got it. Now instead of the pedal stopping halfway before proceeding to hit the firewall it goes all the way down to the last inch or two of travel before real braking power is applied. However the braking power is actually better than before. The car stops on a dollar bill (10x longer distance than stopping on a dime) and I can ACTUALLY MODULATE THE BRAKES NOW.

 

I'm just wondering if the partial elimination of the first stage in the dual stage is normal with these brake lines... anyone else done this?

 

I also had them bleed the brakes with ATE super blue, which has served me well in the past.

 

I've suspected since day one that my car has a failing or erratic brake booster/master cylinder and perhaps this new behavior reflects on it.

[Guest scoobtech]

Is the inner diameter of the new lines the same as the old ?? If different , this could change brake performance . Or you could have some air in the line . 0]

[Guest Legacy777]

What you're experiencing is semi-normal I think. I'd double check and rebleed everything.

 

The boosters are not dual stage boosters, they are tandem boosters. The tandem setup just provides more brake assist.

 

A buddy and I are developing a vacuum regulator, pretty much like a MBC valve, except to limit the amount of vacuum going to the booster. This reduces the over-boosted brakes and provides a more linear pedal feel.

 

We've got a prototype, there's one main thing we're trying to overcome, and if we can tweak it enough to where it's safe, we'll release the details. I haven't tried it on my car yet, but my buddy says it really works!

[Guest Legacy777]

I don't think the size difference in diameter lines would affect too much, but I could calculate the difference if I had inner diameters of the lines and a length.

[Guest remarcable]

These lines were stock replacements for WRX lines, and I was pretty sure subaru uses the same diameter lines between models. The brakes work fine, it just takes some getting used to.

 

On a totally unrelated sidenote, I saw the new Pirate movie tonight and it was pretty damn good. Arrr!