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09-28-2015, 09:54 AM | #23 | |
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Did you get to cycle the ABS pump, and bleed again? I tried a few combinations myself with my Cobb AP3 (clear codes, reflash of custom map, clear ECU), but dont think it helped. Also tried running the engine while on floor jacks, shifting in 1st gear, and triggering ABS.
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12-06-2015, 10:14 PM | #24 | |
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Follow up...
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The end result is that I think that 99.5% of the variation is gone, and the last 0.5% could easily be down to my hypochondria. However it's not the 'rock hard' setup that others have experienced with the ST60. But it's not a disaster either. It's acceptable. Karl. PS: As a side note, I installed Cobb V2 on the car today and it didn't appreciably improve things. C'est la vie...
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12-17-2015, 11:54 AM | #25 |
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Sounds like a lot of what you guys are experiencing is pad knockback as well.....I got it really bad on my 135 with the larger racing brake rotors after long straights. The larger the rotor the more chance to get knock back. And if you have a rotor with any sort of crossed drilling or cooling holes you'll also get pad knock back. Very common thing. If you watch a lot of race cars you'll see them lightly tap the brakes to re seat the pads to the rotor after long straights
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12-17-2015, 11:55 AM | #26 |
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FWIW OP if you haven't decided already. In the long run it's cheaper to do a bbk than rebuild. You'll still want to duct, but you'll get longer life out of the consumables with a bbk, and b/c the pad design is standard for the stoptechs, you'll have a bigger selection of pads and they're much cheaper
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12-27-2015, 11:31 PM | #27 |
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F30 M Performance Front BBK
I was thinking of doing a rebuild with Racing Brake parts but found a great deal on F30 m performance front brakes that i plan to have installed along with endless me20 pads all around. Will updates once i have it all done.
My current setup is Hawk Hp+ all around powerslot slotted rotors (aka stoptech) bimmerworld ss lines endless rf650 f30 front brake ducts (not sure if these helped or not but got them as a gift so why not install) brakes still fade at almost all socal tracks. not the most confidence inspiring setup so im hoping the 370mm bbk will help Aaron |
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12-29-2015, 04:59 PM | #28 | |
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12-29-2015, 10:15 PM | #29 | |
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But maybe I'm missing something. My understanding is/was that knockback is caused by flexing in the hub/rotor assembly, altering 'effective' run-out, which taps the pads back. But your comment that it happens "after long straights" implies there's other mechanisms at play. Can you explain? Thanks. Karl.
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01-02-2016, 05:04 PM | #30 |
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i think my question would be appropriate in this topic.
i'm not so expert in bmw models, but may be somebody knows, which hub can be used on e82 as an upgrade? i'm asking cause i saw, that oem hub has a lot of play. little explanation . we've used square setup on our e82 (275/275) last season, and at first 1000 km i've noticed, that one of the front wheels have noticeable free play - there are really bad roads here in russia, and after hard winters we have very noticeable tracks on the road surface, so car on 275 wheels pulls really hard on different sides (depends on slope). in some cases i can heard that the pads makes some noise (brake pedal not pushed), and sounds can disappearing, if i change my position on the road and the car pulls less (it's all about road surface). so, first i thought, that hub bearing was died, and i've changed it with new oem one. and, my surprise, but nothing was changed! same wheel playing (with brake rotor of course) on the hub bearing. i think that this issue can add a lot for brakes overheating on track, where hub bearings has a lot more loads. we had no problems with overheating, only thanks our brake system, which is much bigger, than the stock one . on our other track prepared cars with similar wide square setup nothing like this. on m3 e46 i saw similar problem only on very tired hub bearing, and after changing it, problem gone away. ps something like this Last edited by slonik; 01-02-2016 at 05:12 PM.. |
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01-03-2016, 01:13 AM | #31 | |
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01-03-2016, 10:18 PM | #33 |
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So did OP ever install his BBK? Results?
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04-13-2016, 09:41 AM | #34 |
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Months later...
I did. I ended up picking up a Stoptech Trophy BBK for the front. On the track I ran SR34 pads front and PFC08s on the stock rear brakes and some Castrol SRF fluid. The difference was incredible. No fade at all (even after the 135+ mph main straight at VIR), and the stopping power is just nutty. The only problem I have with the brakes is that everything for them is EXPENSIVE. Like stupid expensive. I'm a big fan of the PFC08 pads, but they were ~$550 just for the fronts, and my plan to have separate rotors for street and track were crushed when I realized they were almost $700 for a pair. I know, I know... pay to play and all that, but still... Two things worth noting: 1. Don't use *any* sort of wheel cleaner on the brakes. Not even a basic solution (somewhere in the instructions it says to avoid acidic cleaners). It'll smear the clear anodizing finish. Ask me how I know. 2. These brakes are the most finicky I've ever used in terms of proper bedding. I followed the included directions to a T and still ended up with deposits. On street as well as track pads. So I "cleaned" them by doing 2 or 3 hard slows from 70 with the track pads cold, and then re-bed 2-3 intervals increasing start speed from ~50 to ~70. That worked. Now I've found some signs of melting/cracking in the stock rear dust boots, so I think I'll have to rebuild them after this year's track season is done with. I've also thought about trimming down the Ti shims I got for the stock fronts to fit the rear pads. Gotta line them up and see if that'll work. On the bleeding front, "driving" the car with all four corners on jack stands does indeed activate ABS, and has enabled me to get a much better (but still not perfect, dammit) bleed. Last edited by odj; 04-13-2016 at 09:48 AM.. |
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05-02-2016, 04:06 PM | #35 |
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^ Thanks for the update. Good to hear the BBK is a significant improvement. The pads and rotors are indeed expensive, but I heard that they'll last at least 2-3x times longer than the stock brakes so it comes out cheaper in the long run.
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05-12-2016, 02:44 PM | #36 | |
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In a really basic sense....your rotors are just giant fans. On really long fast straights just the air being pushed out of cross drilled rotors can push back the pads some. Or just even the air just coming out the top of the vanes as it comes through the caliper can do it.
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07-30-2016, 02:07 AM | #38 | |||||
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Since the ABS pump cycling by Dinan, it's just gotten better to where I can say the pedal pressure/response is now consistently good. Quote:
If so, and not saying these are cheap, but these prices aren't too outrageous: Front Rotor - Left - $260 - https://www.amazon.com/StopTech-31-7.../dp/B00FJ0EPJI Front Rotor - Right - $270 - https://www.amazon.com/StopTech-31-7...NP09T1HM5FET67 Front Pads - StopTech "Sport" - $85 - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 Front Pads - StopTech SR32 Race - $257 - https://www.amazon.com/Centric-332-8...+332.8011.18.0 Front Pads - StopTech SR34 Race - $255 + shipping - http://www.redline360.com/stoptech-334.8011.18.0 Quote:
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Karl.
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08-02-2016, 04:49 PM | #39 |
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Update on the racing brake kit. After the whole seal debacle, I got new seals from rock auto and racing brake was kind enough tp send me high temp dust boots. Finally got back on the track, while the pistons are holding up fine, even the high temp dust boots can't take the heat. They are starting to crack after six, twenty minute track sessions. I guess I'm just generating too much heat on the stock size rotors. I hate rebuilding my calipers every year, thinking maybe going with a bbk soon, at least for the fronts. Rears are holding up with the high temp boots.
Last edited by jafo1701; 08-18-2016 at 04:21 PM.. |
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08-04-2016, 10:33 AM | #40 | |
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08-18-2016, 04:20 PM | #41 |
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09-05-2016, 06:05 PM | #42 |
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Guy on the For Sale forum has been trying to sell a year old Stoptech F/R Trophy kit for over a month now. Price down to $3000 shipped with extra set of pads. Can't believe nobody has jumped on this. Solve all brake overheating problems with one purchase.....
I bought the same kit used earlier this year (for a little more money) and love it! |
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09-05-2016, 09:19 PM | #43 | |
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09-06-2016, 11:49 AM | #44 | |
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