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Old 02-13-2008, 05:23 AM   #1
Foxhound
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Default Why is this happening?

Hello all, im kinda new around here. Ive recently bought a 2006 Impreza 2.5i with 10k miles on it. Right now im ~13k and for a while now, whenever I brake at certain speeds (usually around 50), I can feel the car vibrate/shake very mildly.

Normally, If the steering wheel shook as well, I would think I needed rotors/pads, but the steering wheel doesnt shake ONE bit. I only feel the shaking from my foot/leg.

Im pretty sure its just the early stages of warped rotors or wearing pads. Please point me in the right direction!
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Old 02-13-2008, 08:03 AM   #2
mopartodd
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Sounds like you're on the right track. Brakes would be the first thing I'd look at.
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Old 02-14-2008, 01:28 AM   #3
ejicon
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check your break pads, rotors and even check the pressure in your tires. Not sure why the steering wheel would shake but I'm pretty sure it's all connected together.
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Old 02-14-2008, 02:05 AM   #4
Kostamojen
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Rotors are probably warped.
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Old 02-14-2008, 03:42 AM   #5
formula91
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Rear rotors are either warped or something is wrong with the rear part in general. Most likely it will be the rotors. It's strange though, why would it start warping so early on in its life? I guess it's not unusual to get an unlucky case every once in a while.

It is rear because you feel it in the pedal and your seat, but not in the steering wheel. Front warped rotors would transmit vibrations through the steering column as well.

But it wouldn't hurt checking the front rotors or replacing them.

I doubt it is worn pads because then you'd get squeaking sounds or something like that.

I could be improper wheel balancing or alignment... but I doubt it.
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Old 02-14-2008, 03:43 AM   #6
PA-Outback2000
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warped rotors absolutely! check out to be sure though.
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Old 02-14-2008, 04:27 AM   #7
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Quote:
Originally Posted by Foxhound View Post
Hello all, im kinda new around here. Ive recently bought a 2006 Impreza 2.5i with 10k miles on it. Right now im ~13k and for a while now, whenever I brake at certain speeds (usually around 50), I can feel the car vibrate/shake very mildly.

Normally, If the steering wheel shook as well, I would think I needed rotors/pads, but the steering wheel doesnt shake ONE bit. I only feel the shaking from my foot/leg.

Im pretty sure its just the early stages of warped rotors or wearing pads. Please point me in the right direction!
Stop ridding your brakes.
10k warped rotors....pretty bad dude.
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Old 02-14-2008, 08:23 AM   #8
Sylon
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Its warped rotors, I had the exact same problem, except mine were all 4 rotors. And good luck getting SOA to replace them. They don't beleive that there is a common problem with the 06's 2.5i rotors, and that they will warp really soon. Mine did it for a long time, but right around the same mileage as you.

I had to talk them into it, and when all else failed, I had to pull the military card. I couldn't afford the $900 it would take to replace the damn things. They told me it was from "excessive and abusive driving", which I took offense to, because I treat my car like I would my own child, I baby this thing. Its never seen a race track, never driven hard. So, it was complete BS what they were saying and that they wern't going to replace it under warranty.

Finally, I pulled the military card and they told me "they would replace them under warranty as a one-time good gesture".

There is a problem with some of the 2.5i rotors, because I'm not the first to have this issue.
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Old 02-14-2008, 12:27 PM   #9
RS Guy1513
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it's probably material deposits from the brake pads on the rotor..really doubt you warped the rotors unless you are tracking the car like crazy...lots of people will tell you "you wapred rotors". just either try a rebedding procedure, get them cut, or replace them
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Old 02-15-2008, 12:23 PM   #10
jac04
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^^ This is the only person to actually point you in the right direction. The stock pads tend to cause uneven pad deposits on the rotors. Re-bedding the pads may/will help (it worked for me on my Legacy), but you may want to consider installing different pads (like Hawk HPS) and then re-bedding. This should solve your problem.
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Old 02-15-2008, 02:41 PM   #11
RS Guy1513
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and when you stop the car hard and they are hot, provided its five speed, if you can avoid holding your foot on the brakes while stationary, that will help a lil with reducing pad deposits as well
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Old 02-15-2008, 03:47 PM   #12
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I can't believe you could warp your rotors in just 10K, no matter how abusive. I have the same car and I've taken it to the track twice on the stock brakes, stock pads, and I dont' have vibration on my brakes. Either you're riding the brakes, braking hard and holding the brakes down while stopped at lights, or something. My brakes were smoking after my first track day and I never got such shaking or vibrating, they just stopped braking very effectively until I bled the brakes the next day from overheating.
My car has 46000km on it now, which is about 30k miles.
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Old 02-15-2008, 04:14 PM   #13
sadsack
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+2 for pad deposits

Most likely, the first owner did a lousy job bedding the pads, and never did anything more than mild braking. This would cause greater accumulated deposits since they were never "burned off" periodically.
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Old 02-15-2008, 04:55 PM   #14
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+3 on pad deposits, I imagine with uneven braking (riding the brake, pumping it, or holding it at the lights after you've really heated them up) you hotspot the rotors and deposit more material than you would on cold spots... I've driven the piss out of my rotors on my 07 and I've had no issues whatsoever.

You would have to seriously heat up the rear rotors to the point of warping them and I highly doubt your rear brakes can generate that kind of heat.


Stoptech has a great article on the myths of warped rotors, I'm lazy though and don't want to go searching for the link, but I'm sure you can easily find it on their site.

One thing that car probably is overdue for is a proper brake servicing, clean and regrease the slider pins and backs of the pads (copper antiseize to quiet them) , check the wear on the pads (subaru pads last forever apparently)
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Old 02-15-2008, 07:13 PM   #15
RS Guy1513
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Old 02-15-2008, 09:11 PM   #16
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Quote:
Originally Posted by Kostamojen View Post
Rotors are probably warped.
bingo.

time for an upgrade!
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