mattm Posted December 2, 2006 Share Posted December 2, 2006 My car has 40k miles, and starting a few weeks ago I noticed some pretty bad vibration when I brake hard, especially from freeway speeds. Took it to my mechanic and they said the brake rotos were worn unevenly and needed to be turned. They did the job, and everything is smooth now and the brakes feel good (well, as good as they can on this car... a bit weak ;-). I was wondering why this would happen so quickly? I don't drive all that hard, though not totally conservatively either. I do about half freeway and half city driving. Also, I don't understand how brake rotors could even wear unevenly. From my simple understanding of disc brakes, wouldn't the pad rubbing on the rotor automatically even out the wear? It's a different car, but I drove my '98 Integra GS-R for 105k miles with no work on the rotors. In fact, some people may not believe this -- I probably wouldn't have if it hadn't happened to me -- I sold the car at 105k miles with the factory brake pads! Anyway, just wondering why this happened to my LGT... I asked the mechanic what causes rotors to wear unevenly and he said he didn't know (at least he was honest), but he's seen it on plenty of other cars. -Matt Link to comment Share on other sites More sharing options...
melayout Posted December 2, 2006 Share Posted December 2, 2006 Search, the stock pads suck. They leave deposits on the rotor and cause the vibration. I keed I keeed Link to comment Share on other sites More sharing options...
red beast Posted December 3, 2006 Share Posted December 3, 2006 Search, the stock pads suck. They leave deposits on the rotor and cause the vibration. and can be very nasty in spirited driving Link to comment Share on other sites More sharing options...
Xenonk Posted December 4, 2006 Share Posted December 4, 2006 it's also from cooling down.. but at 40k miles, it sounds fair.. 60k would have been amazing.. dont spend money getting them turned, just buy new stock rotors at cost.. I think they are like $70 something a piece now. Keefe Link to comment Share on other sites More sharing options...
caramall2 Posted December 5, 2006 Share Posted December 5, 2006 Ditto on just buying new OEM rotors...and ditto on upgrading pads. My rotors were shot (warped) at about 30k (dealer replaced) and the new pads have been great. Link to comment Share on other sites More sharing options...
NetOpsAJ Posted December 15, 2006 Share Posted December 15, 2006 My rotors are warped at 38k miles. Very annoying. New rotors are $90 each from the dealer and I cannot seem to find a parts shop within 100 miles that carries rotors for my 2005 Legacy2.5GT. Very frustrating. I found a shop that will turn the current rotors for a mere $10.00 per rotor and I have a mechanic friend that will pull the rotors off for a case of beer. Much cheaper than new rotors for now! Does anyone know the spec for minimum thickness of these front rotors? This way I can see if the rotors can be saved. Much appreciated! Link to comment Share on other sites More sharing options...
ilh Posted December 16, 2006 Share Posted December 16, 2006 28mm front (start at 30mm) 16mm rear (start at 18mm) ...according to the "vacation pix" Link to comment Share on other sites More sharing options...
Fat Charlie Posted December 18, 2006 Share Posted December 18, 2006 My rotors are warped at 38k miles. Very annoying. New rotors are $90 each from the dealer and I cannot seem to find a parts shop within 100 miles that carries rotors for my 2005 Legacy2.5GT. Very frustrating. I just looked for them on Napa's web site. Nothing, not even a listing. Very frustrating, indeed. I'm almost at 50,000 on the original brakes, so I'm keeping an eye out but haven't seen anything. Link to comment Share on other sites More sharing options...
rallyfun Posted December 20, 2006 Share Posted December 20, 2006 Turned rotors warp faster I got mine turned when I switched out my pads and I drove 4 months about 5k miles and they warped so I got completely band new set for 140 bucks with 2 year warranty at a local automotive store. Link to comment Share on other sites More sharing options...
mickeyd2005 Posted December 20, 2006 Share Posted December 20, 2006 SOA changed the P/N for the rotors. They must have made a small modification to it. Metallurgical? Link to comment Share on other sites More sharing options...
AirSix Posted December 20, 2006 Share Posted December 20, 2006 $65.84/pc https://www.subarugenuineparts.com/oe_parts_cat.html OR save a buck..... $64.76/pc https://www.1stsubaruparts.com/partscat.html Can anyone suggest a good replacement pad...say something one or two steps above OE? Nothing for autox and such, just a better application for spirited drivers. I tell myself that an N/A Forester is just an STI without all the fluff like, power, handling, style, racing heritage, and curb appeal. Link to comment Share on other sites More sharing options...
gao Posted December 20, 2006 Share Posted December 20, 2006 my rotors wraped on me the first 200 miles! luckily the stealership covered it. It is 75XX miles now and starting to show signs of warpping again.Hopefully they are going to cover it (I painted the claipers). Link to comment Share on other sites More sharing options...
hiymeh Posted December 23, 2006 Share Posted December 23, 2006 I just replaced my stock pads with Hawk and now have a bad pulsation braking at high way speeds. The tire shop claims it is "bent" rims (of course) which is possible, (running winter beaters right now) After reading these posts I think l will get new rotors (45,000 m on car) At what point will I start damaging my new pads? They have only been on for hard braking for maybe 1,000 miles Link to comment Share on other sites More sharing options...
AirSix Posted December 24, 2006 Share Posted December 24, 2006 I would venture to guess it's most likely that one or both of your front rotors have worn unevenly. I'm at 40k now and I think I'll spend the $140 for two new OE's and not think about it again until 80k. I tell myself that an N/A Forester is just an STI without all the fluff like, power, handling, style, racing heritage, and curb appeal. Link to comment Share on other sites More sharing options...
lucas569 Posted December 24, 2006 Share Posted December 24, 2006 they can warp quite fast depending on how fast they heat n cool, for example washing your car after some hot laps = bad. rotor warpage has no set milage, all depends on their heat cycles. Link to comment Share on other sites More sharing options...
KNS Brakes Posted December 28, 2006 Share Posted December 28, 2006 Your rotors are 316mm by 30 mm - just 10 mm less in dia. then STi rotors. I HIGHLY doubt any of them are warped. Your pads - when hot - will leave an uneven transfer layer on the rotor whcih causes the judder. Turning them does 'fix' the issue as it takes off the uneven layer along with many miles of rotors wear - but if you repeat the driving that cuased it it WILL return. TO fix judder - 1- Rebed - hard - maybe twice 2. Sand them w/ garnett paper 3. A VERY LIGHT turn - just enough to scratch them clean - then rebed properly Your OEM pads are garbage when hot - as are most Subaru pads (except STi's) Link to comment Share on other sites More sharing options...
AirSix Posted December 29, 2006 Share Posted December 29, 2006 I haven't felt the "judder" as you refer to it until about the last 5K of driving. I'm at 40K now and it's happening under braking from highway speeds. I'm going to swap out the OE pads for some Hawks and I thought while I was down there I'd swap for some new OE rotors. I've never had good luck with my style of driving with turned or milled rotors under my active left foot. I tell myself that an N/A Forester is just an STI without all the fluff like, power, handling, style, racing heritage, and curb appeal. Link to comment Share on other sites More sharing options...
walshie999 Posted January 8, 2007 Share Posted January 8, 2007 14,000 miles on my 06Gt wagon and i started to feel the front end vibrate under braking and slight vibration at speed( started at approx 10K miles.. Rotated tires and driving vibration lessened but braking vibration stayed. Took it in and this was the result. All 4 rotors warped. All 4 tires out of balance and the front rims (just came off the rear the previous day) bent. Cant believe the rotors ware bent this soon as this car isn't driven that hard. Also find it hard that the rims were bent. Would believe that the ones on back were as they were on the front and they take the most abuse. Would improper mounting of rims at factory cause this or are both the rims and rotors that fragile. Link to comment Share on other sites More sharing options...
Fat Charlie Posted January 8, 2007 Share Posted January 8, 2007 That's messed up. If something were mounted wrong at the factory, you'd have had problems on your test drive. Now, I'd just ask you what you'd hit and leave it at that. Don't be offended- I know you've got no reason to hide that here. A better question here would be who else drives your car? Where do you park it? Something is screwy here. It sounds like damage to me, but I can't come up with a reasonable explanation. Link to comment Share on other sites More sharing options...
KNS Brakes Posted January 8, 2007 Share Posted January 8, 2007 I wonder how many times I have to say that your rotors aren't warped.. Link to comment Share on other sites More sharing options...
praedet Posted January 8, 2007 Share Posted January 8, 2007 An infinite number of times sadly Just like those that use those big BREAK kits Link to comment Share on other sites More sharing options...
tenbaseg Posted January 8, 2007 Share Posted January 8, 2007 I warped 3 sets of rotors on a previous car by braking like a sally. I was afraid of warping them, so I braked real light all the time. That is what was warping them. I learned that my lousy ability to drive a car correctly was the culprit. I changed my braking habits and I haven't had a problem since. I'm either on or off the brake. I never ride them. Link to comment Share on other sites More sharing options...
praedet Posted January 8, 2007 Share Posted January 8, 2007 You did not warp them. That is the point. You created large brake pad deposits on them. Other than VERY rare circumstances, modern brake rotors don't "warp"... Ted Link to comment Share on other sites More sharing options...
KNS Brakes Posted January 8, 2007 Share Posted January 8, 2007 infinite + 1 Link to comment Share on other sites More sharing options...
Effin Ponderous Posted January 9, 2007 Share Posted January 9, 2007 I have just under 12,000 on my 05 and THEY ARE WARPED. sHOULD i even try getting them replaced under warranty? Link to comment Share on other sites More sharing options...
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