Bobbo63 Posted February 21, 2016 Share Posted February 21, 2016 I got a weird vibration that comes and goes @freeway speed. any ideas?i dont think its in the steering cause the steering wheel dont vibrate. Link to comment Share on other sites More sharing options...
johnegg Posted February 21, 2016 Share Posted February 21, 2016 bad tire? rotate front to rear one at a time. wheel balance? same solution to isolate / identify the wheel. it could be anything, any more info? Link to comment Share on other sites More sharing options...
doobaruGT Posted February 21, 2016 Share Posted February 21, 2016 Had similar symptoms that turned out to be a brake slide pin seizure. I would start by rotating tires to see if the shaking comes through the steering wheel. If it does it's probably a tire/balance issue. If not then you can eye the slide pins or other culprits. Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
Bobbo63 Posted February 21, 2016 Author Share Posted February 21, 2016 I just got new tires put on it hoping that it would go away... Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 21, 2016 Share Posted February 21, 2016 Did you get an alignment? Do you only notice it when hitting the gas? If so, that is indicative of a cv shaft. Link to comment Share on other sites More sharing options...
doobaruGT Posted February 22, 2016 Share Posted February 22, 2016 Did you get an alignment? Do you only notice it when hitting the gas? If so, that is indicative of a cv shaft. This is also worth checking into. Start with less expensive culprits and work your way up. Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
Bobbo63 Posted February 22, 2016 Author Share Posted February 22, 2016 it comes and goes... it has nothing to do with the load im putting into the engine... as far as i can tell. Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 22, 2016 Share Posted February 22, 2016 I have a similar problem, though I get it through the steering wheel. At about 65mph, vibrations will come and go. Maybe about 30 seconds or so between no vibration and a vibration that starts off small, but gets quite strong, then fades away again. No visible slop in the DOJ shafts when checking by hand, but I didn't put a pry bar to it. Brake slide pins might be a good thing to check, I've been noticing some weird brake release characteristics, too. Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 22, 2016 Share Posted February 22, 2016 Had similar symptoms that turned out to be a brake slide pin seizure. Did you ever figure out how it was causing an intermittent vibration? Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 23, 2016 Share Posted February 23, 2016 When they seize up it puts constant pressure on the rotor which causes it to vibrate. Link to comment Share on other sites More sharing options...
doobaruGT Posted February 23, 2016 Share Posted February 23, 2016 What he said^ :-) Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 23, 2016 Share Posted February 23, 2016 After driving ten minutes, I put an IR thermometer to the rotors. One rotor at 90F and another at 150F. Would it be safe to say that this is indicative of a problem? I'm going to rebuild the calipers and see if that resolves the issue. Link to comment Share on other sites More sharing options...
doobaruGT Posted February 23, 2016 Share Posted February 23, 2016 After driving ten minutes, I put an IR thermometer to the rotors. One rotor at 90F and another at 150F. Would it be safe to say that this is indicative of a problem? I'm going to rebuild the calipers and see if that resolves the issue. Winner winner! I replaced mine from Rock auto instead of heading down the rebuild road. A friend did the same and ended up with the same problem. Totally your call. Good luck! Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 23, 2016 Share Posted February 23, 2016 Winner winner! I replaced mine from Rock auto instead of heading down the rebuild road. A friend did the same and ended up with the same problem. Totally your call. Good luck! A full rebuild kit with pistons, seals, and hardware was going to be about $40 per caliper. With a returned core, Centric-remanufactured calipers were about $45 per caliper -- a no brainer. At this price, I might just replace all the calipers. Thanks! Hopefully this is the cause of the vibration issue! Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 23, 2016 Share Posted February 23, 2016 If it's just a seized slide there's no need to replace the calipers. If you do go that route you should replace the hoses as well. Link to comment Share on other sites More sharing options...
doobaruGT Posted February 24, 2016 Share Posted February 24, 2016 If it's just a seized slide there's no need to replace the calipers. If you do go that route you should replace the hoses as well. You're definitely right. It could likely be remedied cheaply. It's also possible, like in my friend's case, that the problem could recur a short time later. Sometimes you're paying for peace of mind, a few less Advil, and a few more precious minutes Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 24, 2016 Share Posted February 24, 2016 Yeah that's true. If the money is there I'd go for calipers, pads, rotors and hoses. There is an option for loaded calipers that come with pads but they are usually the cheapies. Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 24, 2016 Share Posted February 24, 2016 It might be a good idea to do brake lines while I'm down there. The pads and the rotors are new-ish (under 5k street miles), and I like the pads quite a bit (Stoptech Street). I cleaned up the calipers a bit the last time, but I noticed the caliper body was quite rusted, which is why I've decided to replace all the calipers. Link to comment Share on other sites More sharing options...
08SpecB_DE Posted February 25, 2016 Share Posted February 25, 2016 Is it the front or rear hanging up? You'd have to make a judgment call on the rotors. If the one dragging has hot spots, you need to replace it, or better yet both for that axle. Link to comment Share on other sites More sharing options...
doobaruGT Posted February 25, 2016 Share Posted February 25, 2016 It might be a good idea to do brake lines while I'm down there. The pads and the rotors are new-ish (under 5k street miles), and I like the pads quite a bit (Stoptech Street). I cleaned up the calipers a bit the last time, but I noticed the caliper body was quite rusted, which is why I've decided to replace all the calipers. I did brake lines as well. Make sure you have a good flare nut wrench to do the job. Cheap ones will slip and strip the nut. In fact, I have a buddy who might sell you his SS brake lines at an exceptional price because he no longer has his GT. SpecB_DE makes a good point about rotors. Restoring balance might mean replacing rotors too. Centrics are a fine replacement and they aren't over-the-top expensive. Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 25, 2016 Share Posted February 25, 2016 Haha, this is turning into a complete brake system overhaul. Might as well replace my master cylinder and booster while I'm at it. /s It's the front driver's side that seems to have the issue. I'm going to start with the calipers. I just did the rotors and pads not so long ago, so hopefully they can be salvaged. doobaruGT: let me know what your friend wants for his lines and maybe we can work something out. Thanks! Link to comment Share on other sites More sharing options...
doobaruGT Posted February 26, 2016 Share Posted February 26, 2016 Yea it does sound like we're going overkill. Still, when rotors heat up and cool rapidly, it opens the door for warping. Just want to make sure you're all balanced out. Maybe just do the calipers and lines and see where that takes you. I'll check with my buddy about his lines. Also, fwiw, when I did the same project I picked up a can of VHT paint and did the calipers. I'm pretty happy with how they turned out and the VHT holds up well. Sent from my iPhone using Tapatalk Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 26, 2016 Share Posted February 26, 2016 Yea it does sound like we're going overkill. Still, when rotors heat up and cool rapidly, it opens the door for warping. Just want to make sure you're all balanced out. Maybe just do the calipers and lines and see where that takes you. I'll check with my buddy about his lines. Also, fwiw, when I did the same project I picked up a can of VHT paint and did the calipers. I'm pretty happy with how they turned out and the VHT holds up well. I'm going to do the calipers this weekend -- I ordered them from Rockauto and they should be coming in today. I was thinking about dropping by the parts store for some caliper paint, maybe a black or a dark blue. Now would be the best and easiest time to do it -- no rust, clean caliper, etc. Put the IR thermometer on my rotors again after my morning commute: Front Driver's Side: 320F Front Passenger Side: 210F Rear Driver's Side: 230F Rear Passenger Side: 200F Definitely seems like something is up with the front driver's side and maybe even the rear driver's side. Rotors and lines will be phase 2. Still have a bunch of other issues and maintenance I need to perform, so I'm not looking for extra things to do! Link to comment Share on other sites More sharing options...
twisty Posted February 26, 2016 Share Posted February 26, 2016 when i was doing the same checks, id get 190-230 all the way around every time, and they were within 15 of each other regularly. from that i knew my issue wasnt brakes. the 320 would make me look at that wheel tho. Link to comment Share on other sites More sharing options...
JF1GG29 Posted February 26, 2016 Share Posted February 26, 2016 Calipers came in today. Unfortunately, it seems that the front passenger side caliper was damaged -- bent slide pin or bracket, maybe? No idea how that happened. I'm returning it to Rockauto and I'll swap out the other three over the weekend while I wait for a replacement. This will let me address the front driver's side caliper, which is the one with the high temps. Will report back after the weekend -- have a good one, boys and girls. Link to comment Share on other sites More sharing options...
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