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Discussion Starter #1
I have a 2014 Mustang GT that has Wilwood's all the way around. They started squealing when coming too a stop so it was recommended by a local shop to replace the rear pads as they were worn. I also just went ahead and had them do the front pads as well. They replaced them with Wilwood's BP10 which is what Wilwood recommended. Anyways, I have the car back now and it's making a groan/moan sound after you release the brakes after they have warmed up. I can't tell if it's coming from the front or back as my loud exhaust is making it difficult to determine. It did not do this with the old pads. It does not do it everytime you release the back, I would say about 50% of the time. The shop said to "break" the pads in for a while and see if it goes away. I've always been told any break noise is bad and it should be check out. The best way I can describe this moan is it sounds like if you are pushing a heavy piece of furniture against a hard floor slowly and it makes a moan/groan sound from the friction. Or if you are driving down the highway and drive over those noise strips they have on the side of the road that makes your tires make that moan sound. I'm not a mechanic so I'm going to have to take this to someone, I guess my concern is if this is normal after a pad change or if something is truely wrong?
 

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If I did the work and there were crazy noises, I would find out what was the cause. But I do my own work. A squeal is one thing, moans are sounding like she aint happy with something the shop did or didnt do. Drive it, follow the shops advice I guess. It will get worse or it will get better. Some pads/rotors do make some noise. Most clear up when they seat. If it dont clear up with in 500 to 1k miles the shop will need to diagnose the noise and check their work. They can only put you off for so long....
You could call Willwood and see if they have any advice....
 

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you should put copper grease between the brake pad and the piston, and sand the pad part that goes against the disc and brake gently for the first 100 miles approx so that they settle and do not crystallize the brake pad
 

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You shouldn't be too surprised that your high performance brakes are making noise.

Just like that large piece of furniture vibrating across the floor, that you used as an example, any squealing, groaning, or moaning noise coming from your brakes is being caused by a vibration.
Oftentimes, it is due to the surface of the rotor not being perfectly smooth. Likely caused by brake pad material that has adhered to the rotor unevenly.
To ensure that the brakes are not noisy, the rotors should be resurfaced/replaced every time that the pads are replaced.
 

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Discussion Starter #6
I did find the bed in procedure off of Wilwoods website. I did it the best I could based on traffic Sunday evening. The moan/groan is still there after the brakes heat up. I spoke to Wilwood yesterday and they are sending me pad shims to have those tried. The tech on the line seemed confused saying he never heard of the brakes making those sounds. I've searched on the internet and it seems fairly common, However no one ever seems to post a fix or come back and say what was wrong if they did get it fixed. I wonder if maybe a caliper is not fully releasing. I know the shop lightly sanded the rotors before putting the new pads on. I did not have these brakes originally installed, The previous owner did. According to his receipts the brakes only have about 8000 miles on them. With that being said, I would hope $350 a piece rotors last longer then that. I I have to replace the rotors, I'll just have some OEM replacements put on the car and sell the WIlwoods. I don't race or anything so the whole system seems over kill or a weekend cruise.
 

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It's expensive to drive a race car!

For everyone's amusement, and education, it would be great if you can find the source of the noise, and post the fix.
But you are probably better off putting the stock brakes back on.... Or one of the factory performance option derivatives... For the intended use of your car.
The Wilwood pads wear out relatively quickly, and the other replacement parts are pricey.

Hopefully the shims will help. At the very least, it will give you an opportunity to give everything a close inspection while the calipers are off.

Good luck!
And keep us posted.
 

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Discussion Starter #8
Yes, I can't say many positive things about the Wilwoods at this point. I ordered the shims and also a caliper repair kit. I guess if that does not cure the problem, I'll just buy some stoptech rotors and calipers or something similar that's closer to OEM. Selling these brakes on Ebay would most likely get me more then enough to pay for all that with some cash left over. I will update once the shop goes back over.
 

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Lets not jump to conclusions here. There is nothing fundamentally wrong with the Wilwoods. They have thousands of satisfied customers. Find the issue, fix it, enjoy the upgrade over the oem blah blah, no character, functional but boring standard ford brakes. lol..
 

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Discussion Starter #10
I'm bringing this back up again. The groaning is now gone, However not the brakes squeal after they heat up and are braking around town. It does it at about 20 mph down to a stop with light to medium pedal pressure. If you push the pedal down hard, The squeal goes away. I've had this to various shops now and have spent an arm and a leg as we've had pad replacements, two rotor replacements that weren't even warped and various inspections. I've about given up with this stupid car and these ****ty Wilwoods. Would I be better off having them take this crap off and put on a powerstop kit? I don't even drive the car anymore because of these noisy brakes and debating just selling it instead of putting more money into the brakes.
 

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Have you tried a non wilwood brand of brake pad.? I have had great luck with r1concepts products and their customer support. Affordable, quality components.
 

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Have you tried a non wilwood brand of brake pad.? I have had great luck with r1concepts products and their customer support. Affordable, quality components.
Certainly could be the pads, especially if they are a higher performance type pad. I've read many threads where people have complained about certain Hawk pads having noise. If you do swap in some new pads, make sure your hardware is lubed up properly. That can cause noisy brakes.
 

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Hearing things like this really get me. I can't tell you how many times I've bought components that were supposed to be an upgrade only to have them turn out to be a pain in the a**. If you enjoy the rest of the car go back OEM and have a good drive. I feel your pain.
 

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Discussion Starter #14
As far as I know only Wilwood makes pads for their own calipers? It seems all the other guys out there make pads for the basic OEM stuff. These new Wilwood pads have no shims on the back and I wonder if putting some disc quite on them would help any. The shop told me the clearance between the pad and the calipers was like zero so they said shims wouldn't even fit anyways. I would try about anything to make them stop squealing around town after they heat up. Might as well be driving a 1970 rusted up Datsun. I noticed Power Stop refurbishes Ford Mustang calipers and powder coats them red. I did see they have the 4 piston Brembo factory calipers. Was thinking about having a shop change all the calipers back to the factory stuff using the 4 piston factory brembo up front and buying some Baer slotted rotors from there using a more OEM ceramic pad. Does anyone think this would be better? Some have suggested to change all the Wilwood rotors since you can't resurface these, I'm not spending $1400 to purchase rotors that are fine. Id would be cheaper to just replace back to factory performance pack brakes and sell the Wilwood **** on Ebay I think.
 

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We put the Power Stop drilled and slotted rotors with Ceramic/Kevlar pads with stock calipers and have had zero issues and super performance. Besides working extremely well the only thing you experience is the ZZZZZZZZZZZ noise when braking you hear as the pads whizz over the holes and slots. One of the better up grades we've done to the Horse.
 

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Discussion Starter #16
We put the Power Stop drilled and slotted rotors with Ceramic/Kevlar pads with stock calipers and have had zero issues and super performance. Besides working extremely well the only thing you experience is the ZZZZZZZZZZZ noise when braking you hear as the pads whizz over the holes and slots. One of the better up grades we've done to the Horse.
I'm thinking of buying this: https://www.powerstop.com/product/power-stop-performance-calipers/#y=2014&mk=FORD&mo=MUSTANG&ss=Base, GT, or Boss 302 models with 4 Piston Front Calipers

Doing the 4 pistons which I believe these are the Brembo style that came with the cars and also the matching factory rears. I've always heard Baer makes excellent rotors and they aren't much more then the power stops. I'm not a big fan of the drilled rotors and would prefer just slotted which Power Stop doesn't seem to make.
 
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