"NinetyQ" (NinetyQ)
09/26/2013 at 01:33 • Filed to: A90Q20V
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"NinetyQ" (NinetyQ)
09/26/2013 at 01:33 • Filed to: A90Q20V | 0
| 7 |
So I've got an issue with the Audi. I took it to a shop a few weeks ago to get checked out after I finished working on it and they said the rear brake calipers needed replaced (along with other things). No problem, I already suspected it. After I got it back though, I noticed that the front right wheel made a weird groaning noise when applying the brakes at low speeds. It's kind of the kind of low-pitched squeak/groan you'd get if you had rubber pressed against metal and moved one of them. Almost a springy groan. Anyway, I have no idea what it is and the shop said nothing about the front calipers.
Could it be the control arm bushings? Because the alignment is currently about 1/8th of a turn to the left and the shop said they didn't want to bother aligning it until I replaced my completely worn out control arm bushings. I plan to begin on that either tomorrow or two days from now, but until then, I'm just wondering if you guys have any input on this.
EDIT: From the same post I put up on Google+, it sounds like it's the control arm bushings. Hopefully the new ones I have will take care of it.
Squid
> NinetyQ
09/26/2013 at 02:00 |
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Is it a continuous groan? or does it only happen with weight transfer? does it happen in reverse as well as forward? have you done the nascar weave to load up the suspension to see if it could be suspension?
Brake noises are generally metallic and cyclical. Try to get someone to drive the car while you listen from the outside. I would think that you'd get more of a clunk or thud from the control arm bushings and it would happen at any speed. It kind of sucks but you might have to do the bushings and get it aligned then try to see what else is going on. If the CA bushings are shot, there is a good chance that all the other rubber bushings can be shot as well.
Also if the caliper its self was the culprit in the 'springy groan' it would most likely be making the noise while applying pressure while stopped. I dunno, those are my best guesses.
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NinetyQ
> Squid
09/26/2013 at 02:26 |
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It is continuous at low speeds until the car comes to a halt. The only other time I've heard something like this was when the rubber strut mount on my Grand Prix needed replaced.* Hopefully it's not that on the Audi. I'm not prepared to dump much more money into this just yet.
*the noise was similar, but ocurred under different circumstances.
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Squid
> NinetyQ
09/26/2013 at 02:28 |
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I would try to isolate the noise by loading and unloading the suspension while not using the brakes. But it really doesn't seem to be brake related from my arm chair QB spot. It is most likely another rubber bit that has gone to hell. what year is the car?
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NinetyQ
> Squid
09/26/2013 at 10:33 |
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'91 but I have noticed it in literally no other situation. I haven't whipped it back and forth hard but I'm no grandma around turns either. I imagine if it would rear it's head in other ways I would have noticed it by now.
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Squid
> NinetyQ
09/26/2013 at 16:19 |
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well, get your wheels off and take off your calipers and check pads for unusual wear and grease any contact points of pads to calipers with high temp synthetic caliper grease. If your calipers have slider pins they need a good dosing of grease and I guess it could be the pad contacting the caliper in some unusual way. Is there any vibration in the brake pedal when the noise is happening?
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NinetyQ
> Squid
09/26/2013 at 18:59 |
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I think I'll just have to go through with the jobs I'm already doing (rear calipers and control arm bushings all around) and then analyze where the noise is coming from. I drove it today and it's hard to pinpoint what is causing what. The wheel vibrates a bit whenever the car is in motion. Didn't notice any pedal vibration while braking (and I would probably notice; I've had warped rotors before on my other car).
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Squid
> NinetyQ
09/26/2013 at 19:04 |
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Welp you got your work cut out for you. At least when you are doing the bushings you will have the calipers right in front of you. and with all of the control arms out you'll have carte blanche to poke around and hammer on things to see if it resonates in the same tone as your noise. Good luck and I salute you for tackling the challenge of keeping an old audi on the road.