Reducing squeel after HPDE
 

Carbotech XP10's in my BRZ worked fantastic for the HPDE i went to. Before the HPDE the brakes were only loud when i was on the pedal which i was perfectly fine iwth. Now after the HPDE the brakes seem to squeel pretty much all the time - i can tap the brakes and it seems to go away for a split second.

Any suggestions on what i can do? Was thinking about cleaning & re-lubing the caliper slides and cleaning off whatever grease didn't get burned off the back of the pads. There isn't any shims on the pads.

clean off your brake dust

From?

XP10's are race pads, they squeal -> refer to Carbotech's definition.

Carbotech™ XP10™ is not recommended as a daily-driven street pad due to possible elevated levels of dust and noise.

You should not be running these on the street. Get Carbotech 1521 bobcats for low noise/street use.

I understand these are race pads. The question is what changed before and after the HPDE in terms of noise? Why is there a constant squealing now even under no braking? Only guess was that the caliper slides are dirty and the pad is not fully returning back?

Once again i'm not trying to say "OMG why are my race pad squealing guys!?" Rather asking what changed before and after the HPDE that's causing the noise.

Did they start squealing right after the HDPE day, or was it a couple days after?

You can try re-bedding them, but from what you're describing I don't think it'll do much.

It was 1-2 days after the first HPDE that i really started to notice it.

@CSG Mike

This is normal. Once you actually "use" the brake pads and get them into their operating temp range they will change to their designed operating attributes. Only after this occurs the first time do you really know what they will sound like. Street pads tend to have less metal content and lower friction coefficient (lower initial bite). Race pads have higher initial bite - especially pads such as the xp10. Good street pads that are low dust and good life will have very low friction coefficient compared to the pads you are using but are enough for street use (key word "enough").

You are in essence cleaning off the pads after first use and the noise is going to happen as the pads are seated. As it appears you have never used XP10 pads before - this is perfectly normal - nothing you can do about it. So you learn to live with the noise "because racecar" or you get street pads to swap out. You can clean your rotors all you want - the noise will just come back.

I agree CSG Mike will likely chime in a more technical or likely more accurate response.

So in essence once the pads / rotors have been properly heat cycled this is the type of noise you can expect from race-grade pads such as the XP10's.

I'll pickup some Bobcat's and hopefully those will be a bit quieter between HPDE's.

Thanks for your help. :)

This is why I have myself some nice AP Racing sprint brakes - easy to swap out the brake pads between track days and going back to street mode.

The bobcats will be fine on the street as I had them on my C6Z06 a while back and they dusted less than the stock brakes but had more bite.

Just follow the AP racing diy on how to bed brakes when switching the pads. It works well if you can find the space to do the 60-5 mph brake runs.

Oh forgot to add I am using Ferodo ds2500 and well they were quiet at first but once I got a GOOD run on them at my first HPDE at Texas World Speedway, they now squeal like a freight train a mile away. My buddy has the same setup and he also is gloriously loud when braking everywhere.

He is lazy just like me and we have yet to swap street pads back in since well see "lazy."

This is NOT normal.

I use Carbotech XP10's in the rear and even more aggressive XP12's in the front. They squeal like a freight train when stopping and shed dust like a coal factory. I use them on my supercharged ZO6 Which I run in Autocross, HPDE's, 1/4, and 1/2 mile events.

The difference is, they do not squeal AT ALL when I'm not touching the brake pedal. Why should they? Any time the pedal is pressed, they squeal.

Here is a video using those pads. There is no squealing whatsoever until the brakes are used a bit at the very end when they are slightly warm.

[ame="http://www.youtube.com/watch?v=QVGPNTtNw8g"]http://www.youtube.com/watch?v=QVGPNTtNw8g[/ame]

I'll be taking out the pads to clean everything and see if i can identify a cause (glazing, excessive drag, etc).. Hopefully after i clean the calipers up it will take care of the problem.

Good luck, that has to be frustrating. It does annoy me a bit with all the squealing, so I can understand the issue if it does it all the time. My car makes enough noise as it is, so I said F it...what's a little brake noise at this point. :lol: