Si_s Supe Posted February 25, 2014 Share Posted February 25, 2014 My Jspec NA auto has a strange noise occurring only when moving forward at manoeuvring speed whilst turning left. It's a loud humming noise coming from the front that can only be described as like feedback when a microphone is placed in front of a speaker. Only happens when moving forward, on varying degrees of left lock (from around 1/4 to full lock) brakes on or off. I've not had the car up in the air for a look yet, but thought I'd pose the question first. A search hasn't shed any light. Any suggestions gratefully received. Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 25, 2014 Share Posted February 25, 2014 PAS pump or wheel bearing Quote Link to comment Share on other sites More sharing options...
TT Paul Posted February 25, 2014 Share Posted February 25, 2014 PAS fluid low? Quote Link to comment Share on other sites More sharing options...
Si_s Supe Posted February 26, 2014 Author Share Posted February 26, 2014 I shall check all of the above. Can't imagine it's pump related as makes no difference if your applying pressure to the wheel. It's purely forward movement that brings it on. Speed related too. The faster you move, the louder it gets. Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 26, 2014 Share Posted February 26, 2014 You said it was only at manoeuvring speed Is it louder only or does the pitch change as well? Could be a brake pad not bouncing back away from the disk, so it still has slight contact -check the caliper for it seizing up in some fashion. If a wheel bearing was bad enough to be heard while manoeuvring it'd be screaming at you in a straight line at any decent speed. Quote Link to comment Share on other sites More sharing options...
Si_s Supe Posted February 26, 2014 Author Share Posted February 26, 2014 You said it was only at manoeuvring speed Is it louder only or does the pitch change as well? Could be a brake pad not bouncing back away from the disk, so it still has slight contact -check the caliper for it seizing up in some fashion. If a wheel bearing was bad enough to be heard while manoeuvring it'd be screaming at you in a straight line at any decent speed. Sorry, that wasn't explained very well was it! Haha. Gets louder as MANOEUVRING speed increases. But then again, to be fair, I've never driven round in a left circle at 30mph so may still be there! Just as you pull away left it does it, as soon as you start to straighten the steering up it goes away. Pad could be a good shout. One I had considered but as the noise doesn't go away if you press the brake I discounted it. I took a very short video pulling out of my car park at home this morning, I'll upload it and post a link. Quote Link to comment Share on other sites More sharing options...
Si_s Supe Posted February 26, 2014 Author Share Posted February 26, 2014 Here's a video: http://youtu.be/cz7x9NfYTNY Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 26, 2014 Share Posted February 26, 2014 (edited) Might be worth jacking up the front end up and turning to full lock and spin both wheels by hand and see if doing that sheds any light on where the noise is coming from, it might be harder to turn one side more than the other if its brake related. After you've been for a drive is one side hotter than the other near the brake caliper, use the back of your hand but don't touch Edited February 26, 2014 by Dnk (see edit history) Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 26, 2014 Share Posted February 26, 2014 Might be worth jacking up the front end up and turning to full lock and spin both wheels by hand and see if doing that sheds any light on where the noise is coming from, it might be harder to turn one side more than the other if its brake related. After you've been for a drive is one side hotter than the other near the brake caliper, use the back of your hand but don't touch This is all good advice - noises at low speed can be emulated by you manually spinning the wheel. Also, spin the wheel and hold the suspension spring, you'll feel any graunchiness from a bad wheel bearing through the spring. Quote Link to comment Share on other sites More sharing options...
Si_s Supe Posted February 26, 2014 Author Share Posted February 26, 2014 Cheers guys. I'll give all of the above a look over at the next chance I get. Will post anything I find here! Quote Link to comment Share on other sites More sharing options...
Dnk Posted February 26, 2014 Share Posted February 26, 2014 To totally rule out the calipers seizing you could pop the front wheels off and ease the pads away from the discs using a lever or flat blade screwdriver to push the pads back thus pushing the pistons back into the calipers, then pop the wheels and do you test without touching the brake pedal. Quote Link to comment Share on other sites More sharing options...
Si_s Supe Posted February 28, 2014 Author Share Posted February 28, 2014 Haven't had the chance to get the wheels off with work and weather as it is, but after driving the car today and listening to this noise some more, I'm convinced it's a binding front brake. It's not excessively warm after driving so it's obviously only slight, but I think if I free up any sticky pistons and copper grease the back of the pads all round then that'll be problem solved. The rears squeal under light braking too so I just suspect badly (recently) fitted pads. Quote Link to comment Share on other sites More sharing options...
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