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Old 05-31-2012, 12:40 AM   #1
dictoresno
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Default Thump/clunk under slow speed braking - any ideas???

So about a week ago, i noticed a slight thumping noise that corresponds with wheel speed. I can feel it in the steering wheel and in the brake pedal. It only happens sometimes, not all the time, while braking under 10mph. I can be driving along normally and then just slow down to approach a stoplight and once i hit about 10mph, I can feel/hear it until the car stops. Gets slower as the car does, at the same pace as the wheels/axles. I recently had new tires put on, but that was 2 months ago and this only started happening a week ago. Lugnuts are tight, as I figured thats what it was at first. Then i figured maybe axles, but it doesnt make any noise while turning at all or at any other speed. It only thumps while braking to a stop. Any ideas before I get my buddy to throw it on a lift? It sounds more like its coming from the front drivers side.

sounds similar to this guys noise. but no where near as loud and only under slow braking. and i havent had any recent brake work done.

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Last edited by dictoresno; 05-31-2012 at 02:20 AM.
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Old 05-31-2012, 12:55 PM   #2
drewmob
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Could be a warped rotor.
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Old 05-31-2012, 02:44 PM   #3
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Check all the bolts around the control arms, brakes, hubs and axlenuts and make sure nothing has come loose. I once found a loose/wobbly axlenut, though it wasnt all THAT loose, it made a clunk over certain types of bumps.
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Old 05-31-2012, 02:54 PM   #4
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You should check the axles too, with the car either up in the air or with one wheel lifted up get under and pull firmly (but not super hard) on each axle towards the wheel and back, if the axle moves you might need to have it put back in or you might need a new one. The retaining clip on my rear axle popped out once and it made a similar noise and feel.

Also check wheel bearings while you have the wheel up... also good idea to check what mikey said too....
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Old 05-31-2012, 11:42 PM   #5
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thanks for the tips. im rolling over to my buddys shop in the morning to put it on the lift. ill see what i can come up with. i just rebuilt my engine a few months ago, this is a never ending money pit lol.
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Old 06-06-2012, 06:42 AM   #6
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I haven't had a chance to get the car in the air really yet. But we were able to jack up the one side it sounds like its coming from. My front struts are on their last leg but I don't think that's causing the noise. It seems to correspond to what feels like a high point or warped rotor. Will keep the thread updated if I find out anything else.

EDIT: this thread seems promising, states that its heat related. basically it bears some similarity to my issue. it wont happen on cold days/cold start ups. only occurs once the car is warmed up and have been using the brakes enough to the point where they are hot.

http://tsx.acurazine.com/forums/showthread.php?t=833978

Last edited by dictoresno; 08-18-2012 at 04:34 AM.
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Old 08-18-2012, 03:51 AM   #7
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update: replaced both rotors and pads. the bottom slide bolts on both calipers were seized so i heated and removed them, used a bench grinder to clean them up, regreased and reinstalled. all the noises went away. its been over a month of working just fine, but the braking noise has come back.

again, it corresponds to wheel rotation and ONLY happens under light braking and it doesnt always happen....its intermittent. push harder on the pedal, it goes away. its an audible thunk over and over, and i can feel it in the pedal/floorboards. im really stumped now.
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Old 08-18-2012, 07:52 AM   #8
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have gf/brotato/coworker/some d000d drive the car while you stand outside and listen for where the sound is coming from....it maybe easier to loaclize from outside the car
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Old 08-18-2012, 08:59 PM   #9
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Quote:
Originally Posted by Uncle Scotty View Post
have gf/brotato/coworker/some d000d drive the car while you stand outside and listen for where the sound is coming from....it maybe easier to loaclize from outside the car
my buddy is a mechanic. we did that, its from the front end/hub/brakes area. as stated in the other thread/link i posted, it only happens when warmed up.
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Old 10-14-2014, 08:48 PM   #10
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Did you ever find out what this was pertaining to ? I have the exact same issue with my car and can't figure out what it is ?
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Old 10-16-2014, 10:45 PM   #11
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cv axle maybe
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Old 10-17-2014, 11:11 AM   #12
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A CV axle will typically make noise during slow speed turns but not in a straight line. A ticking is more common. You will not 'feel' a CV joint issue until it becomes seriously bad. The noise will likely become so loud and common by that point, you will have already replaced it.

Can you feel a dragging feeling in the car or any kind of slight shuttering corresponding with the noise? Even if you don't, it still sounds like a wheel bearing to me. If the sound is rotational and localized to one side of the vehicle in the wheel/knuckle area, you've got a few options:

1. Wheel bearing - wobble the wheel with the car lifted; this is hard to describe but you can either have an alignment shop do it for free or check out some YouTube videos for examples
2. Brake rotor - check run out with a rented magnetic dial indicator, or buy one - and don't forget to put the lug nuts on the studs before you check this... the rotor will wobble otherwise; if you have run-out, it could be an indication of improper wheel nut torque, damaged hub/knuckle, or worn wheel bearing; make sure you fix the cause before having the rotor turned or replaced
3. CV joint - check for a torn boot, note that these can and will wear/fail with the boot still intact

I would check them in that order. I didn't watch the video as recorded sounds are almost impossible to diagnose, but if you could describe the sound as a groan or deep/heavy whine, it's probably the bearing.

EDIT: I watched the video... can you feel anything significant (serious vibration, etc.) in your braking foot while this is occurring?

Last edited by mrsaturn7085; 10-17-2014 at 11:19 AM.
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Old 10-17-2014, 07:57 PM   #13
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i know my car made a funny kinda klunk-ish noise when the front endlinks were binding up a bit
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Old 10-18-2014, 09:33 PM   #14
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Unless you have an issue with debris stuck to the axle, the end-links should not create a rotational noise.
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Old 10-19-2014, 12:41 AM   #15
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im just throwin **** at the wall to see what sticks


there are only a couple things that can, really, cause a 'rotational' noise.

eliminate them one by one and not find the cause????

you MISSED the cause the first time around

try again.
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Old 10-24-2014, 06:35 AM   #16
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Thank you for the check list, I will go down it one by one this weekend and report back. It's getting to the point now where I can't tell if it's the back or the front but it's on the passenger side where you can hear it the most. Now even when you pull the ebrake it makes a weird noise.
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Old 10-27-2014, 12:07 AM   #17
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get it up on a lift and drive it slowly and have somebody localize the noise
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Old 09-08-2016, 04:03 PM   #18
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Old thread but who cares...

Had this happen to me. Turned out to be the left front axle backing out. The lock nut on the hub was hanging on by a thread. Made the wheel feel like a wheel bearing was going bad. Could rock the whole thing. Anyways. Got a big ass torque wrench and tightened her down. Fixed it up good. Anyways. Hope this helps some
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Old 04-15-2019, 11:05 PM   #19
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Hate to do this, but bringing this back up.

Have a 2016 Base STi with just over 40k on it now. I just had KNS rotors (by DBA) and Hawk 5.0 pads installed on the car by the local Subaru dealership.

Prior to the brake job, there were 0 issues with brakes outside of them getting low and needing to be replaced. When the job was done, and they bedded the brakes, I heard some squeaking. Set up appointment to bring the car in the next day and on the way in, heard the same noise as OP in that youtube video.

For me, the noise comes on when braking moderately to heavy. There are no vibrations in the car, I don't feel anything and I didn't see side or rear view mirror shake. If you don't press firmly on the brakes, you won't get the sound at all actually.

They had the car and looked at different things until I sent them the youtube video and thread. They decide to swap the pads on the passenger front. When done, mysterously the noise went away....for maybe 230 miles.

In that time, I did press very firmly on the brakes and had no issues. Then I had to hit them again one day out in the country and BAM, noise started all over again.

Any other thoughts on this??? I've seen a few threads where DBA rotors and Hawk pads seem to have issues.

And from the OP, what I can't tell is if DBA said that the noise from the video is common and will go away or if it was the squeaking the OP was hearing. I can't get ahold of DBA brakes as the number I have on the internet sends me to some weird place unrealted to DBA.

Looking for anything anyone can think of with the new information I've given on this.

Thanks!
Gary
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