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2006+ brake proportioning valve for F-body brakes
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jmakinen
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PostPosted: Sun Jul 01, 2012 11:18 am    Post subject:  2006+ brake proportioning valve for F-body brakes Reply with quote

Here's my thinking- the 2006+ Impala's have dual-caliper pistons in the front, and the same brakes as us in the rear, yet they don't nose-dive really hard. So my philosophy is that the brake proportioning valve must be more biased towards the rears. And if that's the case, then maybe instead of hunting around for a GXP brake proportioning valve to stop my F-body's from making my car nosedive, I should be searching for a much more common (and possibly cheaper) 2006+ brake proportioning valve. Any thoughts on this? Am I wrong on anything? Maybe Z-spot can give us some part #'s to compare. And would they swap?

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PostPosted: Sun Jul 01, 2012 11:29 am    Post subject:   Reply with quote

I'm thinking your nosedive is a combination of that heavy ass push bumper and struts that are on their way out... might want to look into that before monkeying around with stuff that likely won't make a difference.

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outonthetiles
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PostPosted: Sun Jul 01, 2012 11:43 am    Post subject:   Reply with quote

Yeah, I'm with Iffy on this. The nosedive is not due to improperly proportioned brakes. I'd look in to the condition of your struts, and replace if they're worn out.


I have F-body brakes and some pretty serious pads, yet I don't any more nosedive than is normal.

You're always going to have some sort of nosedive under braking. If you look at our cars, the wheelbase is about half of the total lenght. There's some serious overhang there. Our engine is out in front of the front wheels, that's a lot of weight.

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jmakinen
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PostPosted: Sun Jul 01, 2012 11:47 am    Post subject:   Reply with quote

Pushbar isn't that heavy, I can literally lift it with my pinkie. It's made of aluminum. And I've seen plenty of other threads stating the same thing- hard nosediving after the F-body upgrade. I know my struts aren't out of whack, but they're getting replaced anyway.

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PostPosted: Sun Jul 01, 2012 11:49 am    Post subject:   Reply with quote

Whatever man. If you post a thread, accept whatever advise you get. My apologies for thinking the push bumper was heavy (I've never seen an aluminum one), but the struts should be the first thing you address...

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outonthetiles
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PostPosted: Sun Jul 01, 2012 11:54 am    Post subject:   Reply with quote

Try it, let us know how it goes. But I can tell you that brake bias is to ensure that the front wheels don't lock up before the back or vise versa. Nose dive is affected by spring rates, shock valving, and suspension geometry.

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PostPosted: Sun Jul 01, 2012 11:58 am    Post subject:   Reply with quote

IffyG wrote:
Whatever man. If you post a thread, accept whatever advise you get. My apologies for thinking the push bumper was heavy (I've never seen an aluminum one), but the struts should be the first thing you address...


Don't know why you're getting so bent out of shape. He just stated it was a lightweight variant. Confused

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jmakinen
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PostPosted: Sun Jul 01, 2012 12:03 pm    Post subject:   Reply with quote

Maybe my suspension IS getting worn out. It still sits higher than a stock Impala with the 9C1 springs, and doesn't really lean during cornering, but maybe the struts are worn. But anyway, would there still be a difference in brake bias between the two proportioning valves?

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PostPosted: Sun Jul 01, 2012 12:04 pm    Post subject:   Reply with quote

PushrodPower wrote:
IffyG wrote:
Whatever man. If you post a thread, accept whatever advise you get. My apologies for thinking the push bumper was heavy (I've never seen an aluminum one), but the struts should be the first thing you address...


Don't know why you're getting so bent out of shape. He just stated it was a lightweight variant. Confused


I'm not bent out of shape. I now understand that its a light weight push bar, but it doesn't change the fact that bad struts can amplify nose dive. I'd be working on those before doing anything with a brake proportioning valve. It appears that he wants someone to tell him to go ahead and do it and I doubt people are going to tell him that until he addresses the other (more likely) causes.

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outonthetiles
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PostPosted: Sun Jul 01, 2012 12:08 pm    Post subject:   Reply with quote

Again, nose dive is affected by spring rates, shock valving, and suspension geometry. Not brake bias.

If the nose dive bothers you, look into stiffer springs and some AGX's

If you're locking up one axle before the other, then I'd look into brake bias.



I'm all for expirimenting though, so if you try it, let us know what happens. I don't know of anyone doing it.

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PostPosted: Sun Jul 01, 2012 12:35 pm    Post subject:   Reply with quote

So basically having F-body's just pointed out my weak front struts. But anyway, I'm certain I've seen threads on other forums about changing out the proportioning valve to make the front/rear brake bias better. That was the purpose of this thread.

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outonthetiles
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PostPosted: Sun Jul 01, 2012 12:46 pm    Post subject:   Reply with quote

I was under the understanding that this thread was about changing the proportioning valve to specifically compensate for nosedive.

Changing it for proper brake bias isn't a bad idea. There are a lot of things to consider when doing this, though. F body brakes have better stopping power than our stock brakes. There is more friction area on the pads, for one. The pistons in the brakes are bigger though, which means they require more line pressure to exert the same pressure on the pads. Because of this, its not affecting brake bias as much as you think. You have the potential for better braking, but you have to press the pedal harder to get it, therefor working the rear brakes harder at the same time. Ugh.. I have a hard time explaining things. Hope this makes sense.

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PostPosted: Sun Jul 01, 2012 12:55 pm    Post subject:   Reply with quote

I figured the proportioning valve would be a good way to stop nosediving, but I don't see why it wouldn't help with overall braking power. I'm just trying to throw ideas out, and see what people think. Maybe it's worth pursuing, maybe not. But I don't know, and that's why I'm asking, so somebody with more knowledge than me can chime in.

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outonthetiles
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PostPosted: Sun Jul 01, 2012 1:02 pm    Post subject:   Reply with quote

I have been Cool



Again, if you're not having problems with one axle locking up before the other, there's no reason to change the proportioning. I have F-Bodies up front, and I lock up all four wheels pretty much at the same time.


Edit: If you're still set on playing around with the bias, I'd try to encorporate something like this before going to 06+ valving. http://www.chasebays.com/produ.....ning-valve

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PostPosted: Sun Jul 01, 2012 1:24 pm    Post subject:   Reply with quote

outonthetiles wrote:
I have been Cool



Again, if you're not having problems with one axle locking up before the other, there's no reason to change the proportioning. I have F-Bodies up front, and I lock up all four wheels pretty much at the same time.


Edit: If you're still set on playing around with the bias, I'd try to encorporate something like this before going to 06+ valving. http://www.chasebays.com/produ.....ning-valve


Thanks, really appreciate it Very Happy Your posts as usual have been helpful, and not demeaning, which is the way a forum should be. And that valve looks pretty decent. I recently got an itch to swap my F-body's for C5's all the way around, and think that would be a pretty useful additon.

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