Brake noise issue

[fast306stang]

Changed the pads 2 days ago to the Z26 pads. I noticed today that I get a scrubbing noise, it's pulsating and not constant.

Any ideas? I don't see how I could have screwed anything up, it's basically 3 pins and the cross spring. I made sure to orient the pads with the tabs in the proper orientation, lubed the backing and the edges of the pads.

The sound seems to come from the driver's side. When I get the car back later today (it's at the dealer getting a new APIM) I'm going to pull it all apart and reseat the pads. Not sure what I should be looking for besides anything obvious.

Bedding, I did 5 hard brake sessions from 40mph down to 10mph, followed by 5 medium brake sessions from 30mph down to 5mph, never fully stopped and then drove about 5 minutes and only had to stop once and didn't hold the brake when stopped.

So it shouldn't be a warped rotor? I get no pulsing when braking, nothing funny at all. Of course the scrubbing sound goes away as soon as I put any pressure on the brake pedal.

Thoughts? Thanks in advance!

Edit to add that this is a Performance Package car with the Brembos.

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[Rapid Red]

Wilwood sourced.

Street pad

Once the brake system has been tested and determined safe to operate the vehicle, follow these steps for the bedding of new pad materials. These procedures should only be performed in a safe location where you can legally bring the vehicle to speed, while also being able to rapidly decelerate.

A pad is best optimized by bedding in the same conditions and temperatures that the pad is designed to operate in. A street pad can be optimized through typical street type driving. A street pad is not designed to work optimally in extreme high heat conditions, and does not need high temperatures to properly bed-in. Performing a series of stops that simulates street driving in a safe environment will give the pads a chance to bed-in.



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Track pads
Once the brake system has been tested and determined safe to operate the vehicle, follow these steps for the bedding of new pad materials. These procedures should only be performed in a safe location where you can legally bring the vehicle to speed, while also being able to rapidly decelerate.

A pad is best optimized by bedding in the same conditions and temperatures that the pad is designed to operate in. A track / race pad is designed to work optimally across higher temperature ranges (as track driving typically generates). For this reason bedding a track / race pad requires generating higher temperature through the bedding process. Start by braking at 50% to 70% pressure. from varying speeds. Once you can feel the brakes start to work more efficiently; perform harder braking up to 100% pressure with cool-down time between applications. If at any time you feel the brakes fade out (loose efficiency and friction) immediately stop and allow the brakes to cool. Depending on the pads exact compound it may take 3+ laps or 6+ stops to bring the pads to operating temperature Proper bedding will deposit an even layer of friction (pad) material onto the brake rotor. Braking too hard too early or failing to bring the pad into its optimized temperature range could result in an uneven layer of friction material being deposited onto the rotor. This results in inefficient and inconsistent friction and poor brake performance.

 

[fast306stang]

I used the new cross springs that came with the new pads. Maybe one needs tweaking? Should I reuse the old one?

 

[PC_GUARD]

I used the new cross springs that came with the new pads. Maybe one needs tweaking? Should I reuse the old one?

Mine didnt come with cross springs...

I hated the ceramic pads. They scrub, and appear to transmit noise

 

[fast306stang]

Mine didnt come with cross springs...

I hated the ceramic pads. They scrub, and appear to transmit noise

I've been reading and thinking, I'm leaning toward the new cross spring being the issue. I should be able to remove it and inspect for rub marks. Either way, I think I'm going to reinstall the old ones.

I'll have to drive on them some more to see how I like them and if there's any negative effects.

 

[Andy13186]

I reused my old spring things , the z26 spring things were too hard to fit in so I just used my old ones. No noise on my z26. I also didnt bed them I just drove normal. I do have baer eradispeed+ slotted and drilled rotors.

 

[fast306stang]

I reused my old spring things , the z26 spring things were too hard to fit in so I just used my old ones. No noise on my z26

Thanks man. This is reassuring that I'm on the right track in my thinking.

 

[PC_GUARD]

I've been reading and thinking, I'm leaning toward the new cross spring being the issue. I should be able to remove it and inspect for rub marks. Either way, I think I'm going to reinstall the old ones.

I'll have to drive on them some more to see how I like them and if there's any negative effects.

For me they're noisy and while they do the job, I didn't care for the bite.

Others loved them but for me the back were awful.

 

[fast306stang]

So my hunch was right. Either these things are slightly out of spec or my rotors have just a slight bit of runout. Both of them were showing rub marks but the passenger side was very very slight and you couldn't hear it. My OCD wasn't gonna let one side be new and the other old lol...

Pic of the driver's side which was the worse one.

 

[fast306stang]

I reused my old spring things , the z26 spring things were too hard to fit in so I just used my old ones. No noise on my z26. I also didnt bed them I just drove normal. I do have baer eradispeed+ slotted and drilled rotors.

Off topic, did you feel any (performance) difference with the new rotors? My wheels are heavy but I don't want to get rid of them, the new rotors should be a good bit lighter? Curious about braking performance as well...

 

[WD Pro]

So my hunch was right. Either these things are slightly out of spec or my rotors have just a slight bit of runout. Both of them were showing rub marks but the passenger side was very very slight and you couldn't hear it. My OCD wasn't gonna let one side be new and the other old lol...

Pic of the driver's side which was the worse one.

Good info thanks - I have these ready to fit …

WD

 

[fast306stang]

Good info thanks - I have these ready to fit …

WD

You're welcome! I haven't done the rears yet...still debating on whether or not I want to upgrade the rotors...

Oddly enough, I almost tagged you because I thought you had already installed yours!

 

[PC_GUARD]

You're welcome! I haven't done the rears yet...still debating on whether or not I want to upgrade the rotors...

Oddly enough, I almost tagged you because I thought you had already installed yours!

I had drilled on a car, and they were ALWAYS noisy/rumbled while braking. I didnt set out to buy them they were just stupid cheap. Slotted at most, smooth discs ftw

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