02LGTSNJ Posted June 14, 2016 Share Posted June 14, 2016 I cannot figure this out. When braking, I get bumpy shaky feeling in the front end when braking in the speed interval from about 48 mph to 38 mph. I can be at full highway speed, say 75 mph, hit the brakes and everything is smooth until about 48 mph and it gets bumpy until just under 40 mph and then clears up again. So far, I have rebalanced and rotated the tires and attempted the bedding process a couple times. The front rotors and pads were just replaced about 4 months ago. I am not feeling the shaking int he steering wheels, moreso just the entire vehicle. Any ideas what is causing this? Link to comment Share on other sites More sharing options...
LegacyUpNorth Posted June 14, 2016 Share Posted June 14, 2016 Sounds like the rotors may have warped. What kind of rotors did you put in? It is entirely possible the rotors could be defective and have prematurely warped. Link to comment Share on other sites More sharing options...
FLlegacy Posted June 14, 2016 Share Posted June 14, 2016 Rotors rarely warp, and if they do it is evident at all speeds. I would be looking at the struts, and lower control arm bushing, and maybe ball joints. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
Rutchard Posted June 14, 2016 Share Posted June 14, 2016 Warped? No. There may be pad deposits on the rotors, but big thick vented rotors don't warp. If you're not feeling it in the steering wheel, I'd check the rear brakes first. Link to comment Share on other sites More sharing options...
FJuan Posted June 14, 2016 Share Posted June 14, 2016 If you don't feel it through your steering wheel, inspect your LCA bushings. I had a torn LCA bushing on my driver side once and it cause about the same issues you're having. Inspect all you LCA bushings. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
02LGTSNJ Posted June 14, 2016 Author Share Posted June 14, 2016 I was thinking it was possibly the rear brakes because I have been noticing more brake dust on my rear wheels than on the front, and thats usually not the case. Link to comment Share on other sites More sharing options...
foxrider28 Posted June 14, 2016 Share Posted June 14, 2016 It could be the caliper going bad too. I put rotors and pads on my sisters car back in February because of a bad shake, it did it while driving so I thought the wheel bearing, he know it all but can't do sh*t husband had a "mechanic" check it out and he said rotors and pads so they showed up and wanted just that and nothing else. I proceed to tear down, then go get new parts since the ones on there I put on 1.5 years ago were under warranty. Goto put the new ones on and the driver side caliper piston would not go in at all, took the bleeder out and out came some nastiness it freed up enough to get it back on around new pads and I recommend her getting 2 new calipers. She didn't have the money so I finished up and went to bed the pads. 35 stop smooth, 35 stop smooth, 50 stop shakes till 35 and smooth again, go up to 70 stop smooth.... 50 shaking..... 35 smooth again. Went back and said, "get calipers ASAP!". Drove it 2 weeks ago move it so I could mow my parents yard and still shakes between 35-50 mph and no where else. Link to comment Share on other sites More sharing options...
FJuan Posted June 14, 2016 Share Posted June 14, 2016 I was thinking it was possibly the rear brakes because I have been noticing more brake dust on my rear wheels than on the front, and thats usually not the case. True, it could be the rear brakes. Also, check the bottom slide pins on the calipers, the rubber dampeners can wear out over time and cause the brakes to wear uneven. I've pulled all my rubber dampeners off my slide pins and it kept the brakes from seizing up on the bottom side of the calipers. Taking them off does not effect the braking. Just something else to look at. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
02LGTSNJ Posted June 14, 2016 Author Share Posted June 14, 2016 Thanks guys, I appreciate all of your input. Hope to have it figured out by the weekend. Link to comment Share on other sites More sharing options...
GTEASER Posted June 14, 2016 Share Posted June 14, 2016 Bed your pads. It worked for this guy. http://legacygt.com/forums/showthread.php/brake-shake-really-dusti-252870.html GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
foxrider28 Posted June 14, 2016 Share Posted June 14, 2016 Good luck. Hopefully it's something simple. I didn't swap rotors on my car until ~100k miles and I did all 4 corners. It had a terrible shake obviously but it only developed in the 30k miles I owned it previous to the change. Link to comment Share on other sites More sharing options...
02LGTSNJ Posted June 14, 2016 Author Share Posted June 14, 2016 I did the bedding process twice already and front rotors and pads were done at 78k I'm now at 84k. It doesn't happen if I jam on the brakes it's more when I'm coming to see slower stop gently on the pedal and only in that 48 down to 38 mph range. Link to comment Share on other sites More sharing options...
FJuan Posted June 14, 2016 Share Posted June 14, 2016 I did the bedding process twice already and front rotors and pads were done at 78k I'm now at 84k. It doesn't happen if I jam on the brakes it's more when I'm coming to see slower stop gently on the pedal and only in that 48 down to 38 mph range. Now since you said that, to me that sounds like it's time for new rotors. Have you replaced your rotors at all? If unsure, take one of them in to your local parts store and have them measure the thickness. When the rotors becomes too thin, the shaking will happen more often. Having the rotors turned will only make them worse in a month or 2. On these cars, it's a good idea to change the pads and rotors at the same time, and not get them turned. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
02LGTSNJ Posted June 15, 2016 Author Share Posted June 15, 2016 Front rotors replaced with pn 26300AG02A and pads 26296AJ010 on Feb 10, 2016 at jus under 78k miles. Link to comment Share on other sites More sharing options...
02LGTSNJ Posted July 28, 2016 Author Share Posted July 28, 2016 Finally got around to replacing my rear pads and rotor and the shake is gone. Its been so.ungodly hot up here in nj its jus miserable be outside, but I got around to throwing the parts on today and it did the trick Link to comment Share on other sites More sharing options...
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