This occurs when you run two different pad compounds on the same rotor. If the compounds are not compatible - then you can get a lot of irregular accumulation of pad material. One way to get it off is to use a very abrasive pad - such as a Hawk blue and drive the car with the brakes cold and dragging the brakes.

just as another note, I was very pleased with the EBC yellows at the track, but will second that for a few days after, the initial bite is a bit wonky. They do appear to be the cheapest trackable pads out there, but I do anticipate replacing them every 3 weekends or so.

I run YellowStuff on the track

I get about 8-10 track days out of a set and I replace them when they get below around 6mm. I do keep the "old" set in my track box in case I need to replace one at the track

I find they work pretty well cold as well as hot.

By far the lowers cost track pads. If you shop around you can find them for under $125 an axle. Summit racing stocks them or dropships them form EBC so delivery is a few days at worst. They also will beat any advertised price by $1.00 an they have free shipping. It can be pricing from 2 different places as well for the price match

would Redstuff and Yellowstuff be compatible? The compounds are different (Redstuff is ceramic, Yellowstuff is aramid??, whatever that is).

I have switched between red and yellow and back without any issues

besides, if you bed the pads when you change them, it removed the old pad material and replaces it with new

I've put 8 DEs and 3 XCrosses on my EBC yellows.
I run Orange group (intermediate-advanced) so I probably don't push as hard as time trials or races. The fronts have maybe 3-4 mm left and the rears barely started.
Heading to INDE Motorsports Ranch in Wilcox AZ this Saturday and I believe this will be the last event for me this summer:( getting hot! Bringing another set of front pads just in case.

3-4 mm on pads is not enough for track use
Remember, pad thickness impacts cooling and the thinner, the less cooling

I would only use pads that thin as replacements if I blew out pads and had a just a session or 2 left

I had bad shuddering issues at my first track day with my new Meyle rotors. It was on the fronts, as I could really feel it in the steering. My old rotors didn't give me this problem, but I'd get brake fade after a few laps of heavy use with the EBC Reds. With the new rotors, they warp (or at least feel like it) before I got brake fade. Previous to the track day, I made sure that I bedded in the pads to the new rotors properly.

I already have the larger brake cooling ducts (not the enormous GT3 ducts, but the larger than stock ones).

What do you all think I should try? EBC Yellows? A different, higher quality and thus more expensive set of front rotors?

Same boat: Reds on Meyles. Sudder when hot, no shudder when cool. Meyles look almost new!
I've opted for New Zimmermanns on the front. Going to season them this week with my reds and probably track them next week with the reds. I haven't received my yellows yet and I don't think I'll have time to bed them for this event.

Thought I should update this older post. I changed the rotors and ran them with the reds. Same problem, judder when hot. I replaced the pads to yellows: wow! No more problems! Too bad I didn’t change the pads before I bought new rotors. :rolleyes:
Ran the rest of the season on the yellows.

Great info, thanks NewArt!

I love EBC yellows, I was running reds at first and not only did I get a shudder I was able to push back my brake points by a whole number at VIR after going to yellows. I can’t say enough good things about the yellows. They also don’t squeak like hawks. The only down side is I get 3-4 track days out of a set (changing the once 25% is left). I’ve bought so many sets of these Amazon put one of those easy purchase buttons on my dashboard.

Can y'all please help me out?
I'd like to order some yellow pads for my track day coming up. Unfortunately, even on EBC' S website, they lust 2 parry numbers, both say REAR on them.

What are the correct part numbers for a 2003 boxster S?

DP41514R rear
DP41208R front

That's what I finally ordered yesterday... But every site I've looked at (including EBC) says both of those are rear. I finally assumed it was an error. Thanks for confirming.

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Interesting to see the love for EBC pads. Over here nobody serious uses these pads. I used the greens a long time ago on a different car.

Well, there are certainly better pads available but the price says it all. Yellows last me a season last year and don’t squeal like a freight train on the track nor on the street. Avoid the reds if you track.

a full season?????? How many events are you doing?

Short season where I live. I only did 4 or 5 events.

I just recently did a brake pad replacement and used ebc red's, and holy *bleep* does this sound like a freight train if you don't GENTLY come to a stop. It's only been a couple days and less than 50 miles of driving since I bedded the new rotors and changed the pads, think I'll give it a week or two before I make hasty decisions.

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