Carbotech 1521 issue

[DocWalt]

I faded them VERY badly the first time I tried bedding them in. Like no braking at all when I pushed the pedal, lol. I haven't felt that since I used HPS pads on my VR-4 (what a mistake) and I know when I did that on the HPS pads they were nowhere near as strong from that point on.

Thanks for the warning about the lip that will form on the back of the rotor, I'll keep an eye on it.

FWIW I can still pull ~1.15 G of braking... so it's not like they're weak. Just not enough to stretch the limits of the RE-71Rs

[dp1]

Originally Posted by DocWalt

I faded them VERY badly the first time I tried bedding them in. Like no braking at all when I pushed the pedal, lol. I haven't felt that since I used HPS pads on my VR-4 (what a mistake) and I know when I did that on the HPS pads they were nowhere near as strong from that point on.

Thanks for the warning about the lip that will form on the back of the rotor, I'll keep an eye on it.

FWIW I can still pull ~1.15 G of braking... so it's not like they're weak. Just not enough to stretch the limits of the RE-71Rs

One pic shows the lip on the brake pad and the other shows the "arm" that connects rotor to the hub (one for each hub bolt that secures a rotor blank), which shaves off that lip on the outside. Those arms don't exist on the inside of the rotor, hence the lip formation.

[jmh128]

QUOTE FROM CSG
In terms of squeal, the AP Sprint/Endurance kits are extremely noisy with almost all pad setups. It's not until you actually beat the crap out of them is when they are quiet (properly bedded). Don't bed in 1521 though as they will cook and then get noisy. [/QUOTE]

Had my AP Sprint kit installed last week with the Ferodo DS2500 pads. I bedded in the rotors and pads as per instructions and ran with them last weekend at the HPDE at Lime Rock. Naturally, they squeaked like crazy on the track and on my daily drives. Was really annoying.

Just got back from having the 1521 installed as my DD pads. Thought the squeal would go away, but they squeal just as badly as the 2500's. The pedal feel is fine and the bite is fine, but I might as well have kept the 2500's on since the squealing is the same.

No, I didn't bed in the 1521's yet as you seem to belaying not to because they will get noisy. The question:
To bed or not to bed?
And any recommendations if the squealing continues regardless of what I do?

[DocWalt]

Don't bed the 1521s. Mine squealed when warm after bedding. A week of DD use and I scrubbed the bedded in pad off and they stopped squealing. Just drive and they'll slowly take the bedded in pad material off the rotor and return to being OEM quiet.

I used the 1521s at an autocross over the weekend. The pedal is pretty long to hit ABS and gets longer when you get the brakes hot. Kinda weird, because the pads touch very quickly and light pressure you can tell they bite more than OEM and the pedal is firmer. The 1521s also started squealing again after the autocross abuse, they must have partially rebedded. Pretty unimpressed with them, though they don't dust much, which is great.

[jmh128]

Originally Posted by DocWalt

Don't bed the 1521s. Mine squealed when warm after bedding. A week of DD use and I scrubbed the bedded in pad off and they stopped squealing. Just drive and they'll slowly take the bedded in pad material off the rotor and return to being OEM quiet.

I used the 1521s at an autocross over the weekend. The pedal is pretty long to hit ABS and gets longer when you get the brakes hot. Kinda weird, because the pads touch very quickly and light pressure you can tell they bite more than OEM and the pedal is firmer. The 1521s also started squealing again after the autocross abuse, they must have partially rebedded. Pretty unimpressed with them, though they don't dust much, which is great.

Thanks Doc,
Will not bed them and will see what happens.
Jeff

[CounterSpace Garage]

Originally Posted by jmh128

QUOTE FROM CSG
In terms of squeal, the AP Sprint/Endurance kits are extremely noisy with almost all pad setups. It's not until you actually beat the crap out of them is when they are quiet (properly bedded). Don't bed in 1521 though as they will cook and then get noisy.

Had my AP Sprint kit installed last week with the Ferodo DS2500 pads. I bedded in the rotors and pads as per instructions and ran with them last weekend at the HPDE at Lime Rock. Naturally, they squeaked like crazy on the track and on my daily drives. Was really annoying.

Just got back from having the 1521 installed as my DD pads. Thought the squeal would go away, but they squeal just as badly as the 2500's. The pedal feel is fine and the bite is fine, but I might as well have kept the 2500's on since the squealing is the same.

No, I didn't bed in the 1521's yet as you seem to belaying not to because they will get noisy. The question:
To bed or not to bed?
And any recommendations if the squealing continues regardless of what I do?

Ferodo pads make a significant amount of noise compared to other pad companies that you generally see. Carbone Lorraine is worse. The 1521 is meant to be a street compound and we recommend you do not bed them at all. If you did not change the disc, you'll also note that the Ferodo compound has a nice transfer layer on that disc. Using a compound with a lower coefficient of friction will take a significant time to cut that transfer layer off. Also note, your foot may actually be heavier with a lower friction pad, thus, you might be subconsciously cooking the pad.

[CSG Mike]

Originally Posted by DocWalt

Don't bed the 1521s. Mine squealed when warm after bedding. A week of DD use and I scrubbed the bedded in pad off and they stopped squealing. Just drive and they'll slowly take the bedded in pad material off the rotor and return to being OEM quiet.

I used the 1521s at an autocross over the weekend. The pedal is pretty long to hit ABS and gets longer when you get the brakes hot. Kinda weird, because the pads touch very quickly and light pressure you can tell they bite more than OEM and the pedal is firmer. The 1521s also started squealing again after the autocross abuse, they must have partially rebedded. Pretty unimpressed with them, though they don't dust much, which is great.

1521 is meant for street use only. Use your XP for AutoX... cooking the 1521 means the noise will just come back.

[jmh128]

Originally Posted by CounterSpace Garage

Ferodo pads make a significant amount of noise compared to other pad companies that you generally see. Carbone Lorraine is worse. The 1521 is meant to be a street compound and we recommend you do not bed them at all. If you did not change the disc, you'll also note that the Ferodo compound has a nice transfer layer on that disc. Using a compound with a lower coefficient of friction will take a significant time to cut that transfer layer off. Also note, your foot may actually be heavier with a lower friction pad, thus, you might be subconsciously cooking the pad.

I used the Ferodo's with the Essex J rotors and the Bembro calipers on my 2015 Mustang. There was absolutely no noise and that's why I bought them for the Sprint Kit…..before doing any research on this forum.LOL.

Since most of youse guys were recommending the 1521's, I had them installed and was a bit surprised to hear the squealing. I will, however, take your advise and not bed them. Hopefully, I'll get that Ferodo transfer layer off in a decent amount of time.

BTW, when I examined the Ferodo pads, I noticed that most of the pad was smooth. But there were some rough spots on them at the leading and trailing edges. Normal?

[DocWalt]

Mike, I very much appreciate the input. I was lazy and wanted to try the 1521s. I'll likely keep using them for autocross as they work just well enough, even if they feel pretty crap.

Thanks to CSG for all of the help, as well as convincing me to buy the AP kit (jerks ) and all of the track pads I destroyed on stock brakes, lol

[CSG Mike]

Originally Posted by jmh128

I used the Ferodo's with the Essex J rotors and the Bembro calipers on my 2015 Mustang. There was absolutely no noise and that's why I bought them for the Sprint Kit…..before doing any research on this forum.LOL.

Since most of youse guys were recommending the 1521's, I had them installed and was a bit surprised to hear the squealing. I will, however, take your advise and not bed them. Hopefully, I'll get that Ferodo transfer layer off in a decent amount of time.

BTW, when I examined the Ferodo pads, I noticed that most of the pad was smooth. But there were some rough spots on them at the leading and trailing edges. Normal?

The crumbling is a sign you may be overheating the pad. Post a picture, and I can confirm/deny.

[jmh128]

Originally Posted by CSG Mike

The crumbling is a sign you may be overheating the pad. Post a picture, and I can confirm/deny.

Am going away for a few days. Will take pictures when I return. It is possible they were overheated as they got a pretty good workout during then HPDE. Also, during my bedding process, there was one occasion when I smelled some burning when stepping heavily on the pedal.

[jmh128]

Originally Posted by CSG Mike

The crumbling is a sign you may be overheating the pad. Post a picture, and I can confirm/deny.

Here are some pictures of the Ferodos. You can see the roughness towards the edges.
BTW, the Carbotechs are completely silent. I didn't bed them and they are very responsive in the Sprint Kit.

[CSG Mike]

You are defeinitely overheating the pad... which Ferodo compound is it? What exactly is done on your car?

Do you have a datalog?

[ZionsWrath]

The best way to swap, in my experience, between track and street. Drive track pad on street until they start squealing. Then put on street pad.

OT. I think I ruined these rotors what do you guys think? Will it wear back to normal or do I have to replace it to avoid tapering every set of pads I install?