HI All, just wondering if someone might have a wild guess what to look at here: car is making a groaning/vibration (or maybe rubbing?) sound when turning left. It seems to be coming from the front. I haven't had a chance to really look at it; car is at shop today (for new Torsen diff) and they are going to take a look at it.

Sound happens when turning left and when straightening our after a left turn. It's sort of a groan or vibration; doesn't sound like something rubbing to me, but it could be.

Car has been sitting all winter. 2010 GT with 105K miles on it. Last year I replaced lower control arm bushings, ball joints, struts, springs, upper strut mounts. I had a trouble accessing some of the bolts for torque wrench and might not have torqued everything just right. Before taking to shop I retorqued the front LCA bolts as best I could; which I found a little loose. Ball joints were greased when I installed them; wonder if they need more?

I do have brake cooling ducts, which I installed last year, and need to be re-routed a little because the driver side rubs on a full-lock right-turn. I don't think this is it; the sound is different, plus it happens when turning the other way.

Brake pads are track pads, left over from track days last year. Since the car hasn't been driven much since sitting, they are squealing a bit; wonder if they might be making the groan somehow?

I know this is pretty vague, hard to diagnose over the interwebs, but any thoughts, guesses, suggestions appreciated.

Will report back later . . . thanks in advance

 

Our cars have some similarities, like you I have Vorshlag's street pro suspension. I only have the standard '11-'14 brakes, [ G-Loc street pads ] but they're OK for street and autocross. I have slightly smaller tires and wheels. '19x'9 Boss 302 wheels and standard 255x40x19 Michelin Pilot Sport AS3+ tires so I should have slightly more clearance. Since you've recently had the front end apart that's the first place I would look. If it makes this noise at very slow speeds have someone [ wife, girlfriend, buddy etc. ] drive the car in a parking lot at a walking speed and have them turn left while you walk along side and try to figure out where the noise is coming from. If that dosen't work try putting small dabs of grease or magic marker on any parts that get close when turning. You may be able to see if anything is touching when turning from the transfer of grease or scratches in the marker. This may be a tedious process, but it's a start.

 

Fender shield. Undertray.

Those were what mine were. Weird moaning sound that only happened turning a particular direction at speed. Which afterwards made sense given the fender well was eaten right where it would get rubbed on if the tire was pointed at it, so right turns it was. Took me a while to figure that one out.

Hope that helps, can't say it's it, but maybe it is, right?

 

Hi All -- thanks again for the suggestions. It turns out, we think, that the sound is caused by the rear brake pads; they are worn down almost to the backing plate and/or the calipers are a little stuck. I never heard brakes make a noise like this before; but the shop that did my differential thinks it is caused by the rear end shifting slightly during the left turn and the backing plate is rubbing and/or the caliper is sticking. I do check my pads regularly, usually before track days; last time I checked (before my last track day) they were getting a little low but I thought I had plenty left. Apparently I ate up more pad in those sessions than I expected.

The shop also suggested that I replace the calipers while I'm at it; since they are fairly cheap and they could be sticking. I think I will look into a rear caliper upgrade; but last time I checked there was nothing available, other than an entire rear big brake kit, which I don't really need.

I'll report back when it is fully cured.

 

Well, turns out, yes indeed, the rear pads were very low; not gone but low enough that the spring clips were rubbing on the rotor, and that must have been the source of the noise. The rotors look fine.

Passenger side caliper looks OK, slides OK, generally seems to be OK; but the driver side has a torn rubber boot (on the piston). So now I am looking around for parts; I can get a "caliper repair kit" that hopefully includes the correct boot and seals; not sure how to change them but I can figure it out. I can get new caliper from Tasca Parts for $128 but probably not in stock for this weekend. I kinda like the Power Stop calipers, but I wish they came in black, seems goofy to have black on the front and red on the rear. All the other auto parts stores around here only have the cheap remanufactured calipers; I guess they would be fine but I'd like something "better" while I am at it.

https://www.americanmuscle.com/power...red-05114.html

Decisions, decisions . . .

 

I've been having this issue with my 2014 mustang and its driving me crazy to where it's not fun to drive the car. Took it to a shop and they couldn't figure it out. I was on the same idea that maybe my brakes are worn and after hearing that was your issue resolve, I just might do that as well since it has been about 3 maybe 4 years since I've changed them. It is my daily but honestly only put about maybe under 10k since which is why I didn't think thebreaks might be worn

 

Welcome, When You Get it Figured Out or Come Back for Further Searching We Would Love To Have You Post Some Pics in Introductions if So Inclined!

Mgb,

KC

 

Same here as well, as I'll second that!