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Go Back   IWSTI.com: Subaru WRX STI Forums > GD Series STi Discussion (2003/4-2007) > GD-Technical > GD-Braking


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Old 05-24-2007, 10:14 AM   #1
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Default Any advancements for pad knockback cure?

I have an 04 and I have noticed that after taking a hard turn my brakes are unresponsive for a split second.
Has anyone come up with a fix for this besides switching to 05+ hubs? This isn't that big of a deal on the street but when I was at the track, it was a little scary. I basically just braked a little earlier than normal. I plan to get camber plates for more neg camber up front so the problem will only get worse as I add more grip. Switching to 05+ hubs will cost way too much for me. I would rather just save up for a new car if that is the only cure.


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Old 05-24-2007, 10:34 AM   #2
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Default Re: Any advancements for pad knockback cure?

i have never heard of this issue... perhaps there is air in your lines or your lines are expanding too much...
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Old 05-24-2007, 10:38 AM   #3
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Default Re: Any advancements for pad knockback cure?

Start saving! I don't recall any other fixes for pad knockback on the '04's.
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Old 05-24-2007, 11:05 AM   #4
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Default Re: Any advancements for pad knockback cure?

Ya I got the same problem over here, pads knockback. Last week I changed all wheels bearing and is not very better now. Need to check for a vaccum leak in the brake master now just in case.
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Old 05-24-2007, 11:10 AM   #5
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Default Re: Any advancements for pad knockback cure?

Quote:
Originally Posted by chaos311clarity
i have never heard of this issue... perhaps there is air in your lines or your lines are expanding too much...
It is more common on the 04. They upgraded the bearings for 05 which also led to the hub change.
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Old 05-24-2007, 11:16 AM   #6
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Default Re: Any advancements for pad knockback cure?

i see... very strange... good luck.
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Old 05-24-2007, 11:48 AM   #7
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Default Re: Any advancements for pad knockback cure?

Pad knockback springs are probably your best bet, but it will also mean constant pad contact with the rotors and the possibility of added wear, dust and noise. Its not ideal for a street car but then again, taking apart calipers to install springs for every track day isnt ideal either.
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Old 05-24-2007, 05:21 PM   #8
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Default Re: Any advancements for pad knockback cure?

Quote:
Originally Posted by ESmooth
Pad knockback springs are probably your best bet, but it will also mean constant pad contact with the rotors and the possibility of added wear, dust and noise. Its not ideal for a street car but then again, taking apart calipers to install springs for every track day isnt ideal either.
I've never heard of these springs. Wouldn't that rob you of power due to the constant pad contact?
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Old 05-24-2007, 05:22 PM   #9
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Default Re: Any advancements for pad knockback cure?

There is some minor drag but nothing too significant. The springs have a rate of 7lbs so its just enough to push them back towards the rotors after compression.
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Old 06-05-2007, 10:45 AM   #10
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Default Re: Any advancements for pad knockback cure?

you have a link for these? they sound cheaper than the hub swap I just did haha
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Old 06-05-2007, 10:50 AM   #11
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Default Re: Any advancements for pad knockback cure?

the best way to eliminate knockback on an 04 is and 05 hub and bearing pack swap.
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Old 06-05-2007, 10:53 AM   #12
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Default Re: Any advancements for pad knockback cure?

have you done this yet bruce?
the kosei's worked out nicely this weekend...although im going to slot my front c.plates to get more out of them...
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Old 06-05-2007, 11:03 AM   #13
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Default Re: Any advancements for pad knockback cure?

[quote=TR11]have you done this yet bruce?
quote]

the swap is planned for next season. i have this from my sponsor, javid at 6gun:

If you decide, to keep the 5x100 pattern, we are going to start machining batches of the 5x100 05 STi hub kits shortly. These kits use the 05 gear but we machine the hub and upright to fit your current front struts and current rotors / wheels.

i have not gathered in any other details since i'm nowhere near ready to do it with everything else we have going on.
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Old 06-05-2007, 11:11 AM   #14
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Default Re: Any advancements for pad knockback cure?

Quote:
Originally Posted by Neanderthal Racing

If you decide, to keep the 5x100 pattern, we are going to start machining batches of the 5x100 05 STi hub kits shortly. These kits use the 05 gear but we machine the hub and upright to fit your current front struts and current rotors / wheels.

i have not gathered in any other details since i'm nowhere near ready to do it with everything else we have going on.
Would this option be a lot cheaper than doing the full swap?
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Old 06-12-2007, 08:22 AM   #15
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Default Re: Any advancements for pad knockback cure?

Quote:
Originally Posted by na-STi
Would this option be a lot cheaper than doing the full swap?
Yes, a full swap requires the 5x114.3 kit plus front struts, all rotors and all wheels. Certainly a great upgrade, and you will be able to sell your take offs.

The new 5x100 kit (first batch is headed to the machine shop tomorrow) will be a complete upgrade, no need to buy additional parts. The ABS collar presses on and the rest of the parts will mount to your current wheels and struts.

Let me know if you have any other questions.


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