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View Poll Results: knockback?
Stoptech and I have knockback 4 9.09%
Stoptech and I don't have knockback 5 11.36%
Brembo GT (not stock STi) and I have knockback 0 0%
Brembo GT (not stock STi) and I don't have knockback 1 2.27%
wrx sliders and I have knockback 2 4.55%
wrx sliders and I don't have knockback 8 18.18%
Wrx 4 pots and I have knockback 1 2.27%
wrx 4 pots and I son't have knockback 8 18.18%
sti brembos and I have knockback 8 18.18%
sti brembos and I don't have knockback 8 18.18%
AP racing and I have knockback 0 0%
AP racing and I don't have knockback 0 0%
Other aftermarket BBK and I have knockback 2 4.55%
Other aftermarket BBK and I don't have knockback 3 6.82%
Multiple Choice Poll. Voters: 44. You may not vote on this poll

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Old 08-10-2008, 07:43 AM   #1
Yargk
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Default Knockback poll!

Please state whether you have experienced knockback with the brake setups listed. Thanks.
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Old 08-10-2008, 09:24 AM   #2
randy zimmer
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My wheel bearings aren't junk so my brake pedal is always where I expect it to be.
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Old 08-10-2008, 09:24 AM   #3
Arctic Penguin
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: popcorn:
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Old 08-10-2008, 09:31 AM   #4
ButtDyno
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Stoptechs
no knockback that I can feel
application is autox on street tires
pads are BHP XPS front, Hawk HPS rear
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Old 08-10-2008, 11:07 AM   #5
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Two ways to fix knockback. Get kncokback springs under the pistons or upgrade to 05+ STI wheel bearings. Problem solved.

Tony
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Old 08-10-2008, 12:13 PM   #6
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04 sti and i have yet to experience any sort of knockback even with several autox events.
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Old 08-10-2008, 01:16 PM   #7
Web Foot STi
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I've not had any knockback issues at the track (PIR).
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Old 08-10-2008, 06:56 PM   #8
eastcoastbumps
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Knockback is a wheel bearing problem that effects the brakes, so changing calipers won't solve anything.
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Old 08-10-2008, 08:07 PM   #9
Yargk
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Quote:
Originally Posted by Turn in Concepts View Post
Two ways to fix knockback. Get kncokback springs under the pistons or upgrade to 05+ STI wheel bearings. Problem solved.

Tony
Has there been any difference in WRX wheel bearings over the years?
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Old 08-10-2008, 11:27 PM   #10
eastcoastbumps
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Quote:
Originally Posted by Yargk View Post
Has there been any difference in WRX wheel bearings over the years?
No significant changes have been made. All 5x100 knuckles, bearings and hubs are very similar. Knockback will get worse as your wheel bearings wear out. I used to carry an extra set of knuckles with me in my spares box when I went to the track. I also replaced them once a season as preventive maintenance. Now I have 5x114's and I don't worry about them.
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Old 08-11-2008, 01:17 AM   #11
Yargk
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Can you stay with the 5X100 bolt pattern and use the 05+ sti wheel bearings, I don't want to find more wheels.
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Old 08-11-2008, 02:51 PM   #12
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my 04 STI has had knockback with stock brembos and with SSBC Force10 calipers. As stated this is a bearing issue, nothing at all related to the brakes themselves.

Check with 6gunracing for an upgrade to the 5x114 bearings without changing everythign else (axles, struts, wheels, etc)
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Old 08-11-2008, 03:22 PM   #13
DeusExMachina
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+1 on the 6gun kit.

But if you have anything besides STi Brembos, MAKE SURE they machine the hubs properly. Not sure how you can make sure of this, as I informed Javid I was aware of the problem and gave him specifics on my set up, and he still sent me unmachined hubs I had to pay to have machined. He still is ignoring my emails.

Edit: Javid is refunding me for the money spent on machining the hubs, and said that was the last of the "old stock", where they are now machined to properly fit all brakes. I'm happy.

Last edited by DeusExMachina; 08-11-2008 at 04:06 PM.
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Old 08-11-2008, 03:48 PM   #14
eastcoastbumps
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Are you autocrossing or doing track days? Your best bet is to do what ever you can to keep heat out of the bearing. Add brake ducts, swap to a 2-piece rotor with an aluminum hat, and run less aggressive tires.

And then add them to your list of consumables with tires, pads and gas.
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Old 08-11-2008, 07:04 PM   #15
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Quote:
Originally Posted by eastcoastbumps View Post
Are you autocrossing or doing track days? Your best bet is to do what ever you can to keep heat out of the bearing. Add brake ducts, swap to a 2-piece rotor with an aluminum hat, and run less aggressive tires.

And then add them to your list of consumables with tires, pads and gas.
Trackdays, I'm just seeing if there's a reason I should spend more than the stoptechs cost.
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Old 08-11-2008, 07:04 PM   #16
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I see a lot of people with STi brembos and knockback. Is this with stock STis or with WRXs with brembo conversions?
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Old 08-11-2008, 11:51 PM   #17
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Get the Stoptechs. I ran them on my WRX as well as my 2.5RS and they were fantastic. They dramatically increased the bearing life. But if you have a lot of knockback already, it won't go away until you replace the bearings.
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Old 08-13-2008, 04:37 AM   #18
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Quote:
Originally Posted by eastcoastbumps View Post
Get the Stoptechs. I ran them on my WRX as well as my 2.5RS and they were fantastic. They dramatically increased the bearing life. But if you have a lot of knockback already, it won't go away until you replace the bearings.
Increased bearing life due less heat transfer?
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Old 08-13-2008, 12:39 PM   #19
eastcoastbumps
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Quote:
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Increased bearing life due less heat transfer?
Correct.
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Old 08-14-2008, 10:44 AM   #20
pzary3233
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None in my '02 with FHI 4 pots.
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Old 08-14-2008, 10:28 PM   #21
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My knockback issues decreased dramatically with my switch from 4-pots to Stoptechs, but it still will happen as the bearings wear. I just get used to the confidence tap on the pedal before entering the braking zone. If you can get used to left foot braking, it's not a big deal.
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Old 08-14-2008, 10:55 PM   #22
RA Limited
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+1 for LFB and confidence tap.

I am running my stock 4/2 pot setup, and have experienced knockback a few times on high-speed touges, but this is no longer an issue since i started using the above techniques.
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