Maintenance / Repairs :: Low Pitched Intermittent Whomp Sound Coming When Braking At Low Speed
Jan 26, 2016
A couple of weeks ago I came home from work to find my front passenger side wheel completely deflated. I didn't think much of it at the time and thought someone must have let it down. However, ever since then I have had a very low pitched intermittent 'whomp' sound coming from it, when braking at a low speed. When the car comes to a stop, so does the noise.
I'm beginning to suspect that the tyre being deflated was due to it not being properly sealed to the wheel. I'd parked half on/half off the pavement outside my house with the passenger side on the road. I assumed the tyre deflated because it couldn't handle the weight of the car on the tyre. I've inspected the tyre and there are no obvious punctures and the wheel has remained inflated ever since and I've now agreed with my housemate that I can use the drive to park it on for the time being to stop it happening again.
However, before the deflation everything was fine with the car and there was definitely no 'whomp'. What it may be/ways to check what it is myself and/or potential costings of taking it to a mechanic?
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I've tried starting the car while in neutral as well, still nothing. Does this sound more indicative of an issue with the starter or with the battery? My friend and I were trying to get the starter out so I could have it tested but the bolt is on very very tight (broke a wrench trying to undo it). I want to figure out what the most likely culprit is before I go too much further. Unfortunately I'm out of work right now so taking it to a mechanic isn't really an option, but I really really need to get my car fixed.
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I can tell it needs an alignment, but what could I be looking at in order to tighten it up?
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I'm noticing some odd behavior from my Brand New (50 miles) Chevy Sonic. When I get to about 40-45 mph steady, the car seems to apply a small amount of braking every few seconds. The effect is strong enough that my head bobs forward somewhat.
On a long drive, I could see it getting VERY annoying. It really "feels' like braking and not like engine sluggishness, but I"m not 100% sure. I was thinking traction control. I'm going to the shop next week but would be nice to be pre-loaded with some ideas, maybe even some things I could look into myself.
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I have had this issue with the braking system for about a year now. Most of the time when using the brakes, everything works fine, but once in awhile, it seems like the brakes on one (I think one) wheel seem to just let go, apply full braking power, or both one after the other. When this happens, you hear loud clunking sounds (which I guess it the caliper going from on to full off and back again) and the rear of the car will raise and lower with the instances. There are also times when a high pitched squeak sound comes from the wheel (like when a bus uses their brakes) which will normally happen a second before coming to a full stop. It does not happen at the same time, but I think is related. Going off the sounds and rear of the car moving I tend to think this is focusing around the driver's rear tire. The brake fluid has been changed, the brakes have been changed on all 4 wheels, and so have the all brake lines to the cylinders. There are no leaks anywhere in the system. The car does have ABS.
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2007 Sonata SE, 74,000 miles
Just took the car in for brake service (not the dealership) because of what I was convinced was a brake pad sensor warning sound - something I've heard with other cars I've had, and been correct about. However, the tech said the pads were fine.
The sound is a high pitched squeal, intermittent, coming from the passenger front wheel. It can be heard when coasting at moderate speed (30 mph or so), not so much when accelerating, and especially when turning left. It got worse today, with a low grinding sound at moderately slow braking speed that started after about two hours of start and stop driving (house hunting). The car has needed a couple re-alignments and will have to get checked for possible camber? adjustment (rear tires wore badly on outside edges, far less pronounced on front tires). Car has tendency to pull to the right.
Any thoughts on a main culprit here for the squealing-grinding noise or about the possible inter-relatedness of symptoms.
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