brighton98 Posted August 2, 2017 Share Posted August 2, 2017 Can't get rid of vibrating front brakes on 09 Impreza. I have changed rotors and pads twice, cleaned hub surfaces and checked caliper pistons(not stuck). I don't have access to a dial indicator to check runout, but all the new parts can't be bad. At a loss! Quote Link to comment Share on other sites More sharing options...
forester2002s Posted August 2, 2017 Share Posted August 2, 2017 Front wheel-bearings deteriorating? 1 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 2, 2017 Share Posted August 2, 2017 (edited) miles on car?check inner tie rods for play.it's extremely rare for rotors to actually 'potato chip'/warp. Vibration or pulsing when braking is much more likely due to uneven pad deposits. This can occur under a couple of conditions; 1. slamming to a stop on hot brakes and holding them clamped at a long light or waiting for a train. etc. 2. Some folks will develop uneven deposits from weeks and weeks of very light brake use. Like lots of highway driving and very little and/or smooth 'drama-free' secondary road drive.one other uncommon thing is a car that sits in certain weather conditions unused for weeks/months at a time.Often, an easy fix if, find a LONG stop-free road and maintain 30-40mph while using your left foot to 'drag' the brakes. Enough to feel it. Do that for a coupla blocks - making SURE you can follow-up with a stop free half to 1 mile cool-down run. If the problem gets WORSE, you may have a bad spot (altered temper to the alloy) on a rotor. If it gets better, you may need to repeat the left foot drag, or investigate a more intense "bedding in" procedure.good reading here; http://stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths Edited August 2, 2017 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
brighton98 Posted August 3, 2017 Author Share Posted August 3, 2017 55K on car. Symptoms happen with new parts out of box. Tried to bed low mileage pads to new rotors, no change. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 3, 2017 Share Posted August 3, 2017 (edited) what do you feel? seat-of-pants vibration? steering wheel? brake pedal? any sound? are the pads wearing evenly - side to side and inner vs outer? same thickness and parallel? swap tire pairs front to back? I think I'd also check rear bushing on the lca - just not sure where else to look. maybe others will have an idea. Edited August 3, 2017 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted August 3, 2017 Share Posted August 3, 2017 Does the steering wheel shake side to side? If not, the rear brakes are the cause. Other than that it would be a tire balance issue or damage/ something bent from an accident. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 22, 2017 Share Posted August 22, 2017 brighton - still suffering? Quote Link to comment Share on other sites More sharing options...
brighton98 Posted August 23, 2017 Author Share Posted August 23, 2017 Nope--rear rotors!! Thanks for asking. 1 Quote Link to comment Share on other sites More sharing options...
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