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Cool Carbon pads issue anyone?
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06-02-2010, 05:08 PM | #1 |
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Cool Carbon pads issue anyone?
Hi,
Purchased Cool Carbon Brake Pads last November and drove the car for a few weeks with them with no issues at all actually the where performeing really well. Then i put the car to garage for winter. Now this spring as i had my Vishnu meth kit and had been data loging the car i have done lot of hard brakeings, after a few data logging sessions the car started to shakeing like crazy when brakeing so i took it to a friend of mine who is working at the BMW turns out that the BMW:s OEM rotors couldn`t take the heat the Cool Carbon pads make during hard brakeings and the OEM rotors where crooked. Anybody else had similar issues? |
06-02-2010, 06:40 PM | #2 |
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Modern BMW rotors don't "warp" or become crooked that easily. I've done some very VERY heavy and repeated braking from 120mph down to about 40mph for 10-12 times in a 20 minute span and NEVER had I warped a set of stock BMW rotors.
And I am considered freakishly harsh on brakes by my peers. What you are experiencing, is rust deposit from the pad sitting in roughly the same position for extended periods of time. Then after that, the few mild stops produced "deposit" where the rust spots are and makes those spots higher than the rest of the rotor surface, creating what feels like a warped rotor sensation. Problem will clear itself in a couple of weeks of daily driving or switching to a more aggressive track oriented compound. |
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06-02-2010, 08:38 PM | #3 |
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I had some problems with them at the track last week.... after a few hard laps they were juddering like crazy on hard braking. Every session they would be fine for 1 to 2 laps then shaking would start again when they warmed up. I assumed it was just because I hadn't bedded them good enough. Car has 3000 miles and about 2000 on cool carbons. After coming home I took pads off and they were glazed over pretty bad.... I guess it could be improper bedding that didn't prepare them properly for the heat at the track?
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06-03-2010, 10:56 AM | #5 | |
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06-03-2010, 11:41 AM | #6 |
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Cool Carbon pads can easily handle the heat; check for rotor warpage or localized deposits of friction material that can occur from parking car with very hot components and without allowing pads and rotors to cool. Proper bedding initially generally keeps this from occurring. Pads may need to be re-bedded if driven on the street for extended periods between events.
It is also possible that foreign material between the wheel and the rotor surface or between the rotor and the hub can cause vibration after parts heat up. Cool carbon pads dissipate heat generally better than most due to among other things, a hollow fiber being used and they will also will operate above 600C (1112F). Generally track temperatures generated do not exceed 900F . |
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06-03-2010, 11:53 AM | #7 |
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No issue here with CC pads, the shimmy being experienced on track when pads warm up is due to uneven deposits on the disc. Happened to me on track and that was because bedding wasn't complete! It will eventually disappear the longer you drive, or when you redo the bedding process.
Refrain from using brakes at end of each track session and do not use hand brakes. I also store the car for the winter with no problems, and again I don't use the hand brakes.
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06-03-2010, 04:28 PM | #8 |
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Also, make sure your wheels are torqued properly. Overtightened or unevenly torqued lug bolts can cause the rotor to warp when heated up.
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06-04-2010, 07:50 AM | #9 |
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Thanks for all comments.
I`ll be geting next week a new set of ECS-Tuning Drilled/Slotted rotors and a new set of brake lines as we install those we will reinstall the cool carbon bads too, that should solve the issue i hope. |
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06-04-2010, 09:53 AM | #10 | |
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06-04-2010, 11:03 AM | #12 | |
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06-07-2010, 09:59 PM | #13 |
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Keep the discussion up.
I am going to get them (or some hawks) soon and would like to make an educated decision.
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06-08-2010, 04:22 AM | #14 | |
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The CC are however not much better. They where gone in one weekend on the Ring. Personally I do not like the pedal feel with the CC (al lot of pedal travel) and I was not confident on the brakes. To be hones, with the OEM pads I was much more confident. And yes, the brake in was doneproperly I will try an other set (as I ordered 2 sets) and see how these feel. I do not expect something different though. After this set is gone, I will try Performance Friction or Endless. |
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06-08-2010, 08:24 PM | #15 |
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This is a helpful discussion, keep it up!
Hey Ramppo, I was in Turku for a while last month. Finland rocks, one of my favorite places in the world. Not sure I would get drilled rotors. Slotted are OK for track, but not drilled.
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06-09-2010, 01:59 AM | #16 |
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+1. Slotted is prefered. Are there any available as replacement for the original disks?
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06-09-2010, 04:15 AM | #17 | |
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06-09-2010, 08:02 AM | #18 |
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I made several track days with CC and OEM disks.
My experience is somehow similar i.e. getting some vibrations (even big ones) from the front train when you do mash the brakes for several continous laps. This is caused by disks overheating...it is sufficient to let them cool few laps and vibration will be gone. |
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06-09-2010, 11:58 AM | #19 | |
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Severe vibration after warm up and the pads' surface was glazed by end of day 1. Swapped rotors on day 2 and re-bedded the pads to see if it'll make a difference, it did not. I'll bring a different set of pads on the next event and fall back to a set of OEM rotors to baseline the 2 configurations, I'm not happy with the way things are at the moment. (CC pads, breakperformance slotted rotors) |
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06-09-2010, 03:39 PM | #21 | |
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All ready ordered the rotors so drilled+slotted are comeing. My friend(BMW mechanic) clearly stated that the OEM rotors where crooked due the exessed heat from the hard brakeings, i also could see myself the "waves" at the surface of the rotors. I thought that the more cooling the less crookeing effect so my pick was drillet+slotted we will how it works as i get the new RB turbos i will have a lot of logging to do. |
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06-10-2010, 01:49 AM | #22 | |
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