|
Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing. |
|
Thread Tools | Search this Thread |
04-21-2016, 11:57 PM | #1 |
Senior Member
Join Date: Dec 2015
Drives: FRS
Location: HNL
Posts: 126
Thanks: 66
Thanked 44 Times in 31 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Groves in front rotors (replacement advice)
I took my stock FR-S to the track this past weekend and had and awesome time. It was my first track day so I was learning the track and car mostly before pushing any limits.
By the last session I was getting pretty hard on the brakes in the two braking zones. I ended up pulling in early because I felt quite a bit of fade in the brakes and noticed when I got home my front rotors looked like this: I was thinking of just getting maybe a slightly higher quality blank rotor. I really enjoyed driving on the track and it was definitely the most fun I've had in the car but the wear and tear on the car and higher risk probably won't have me doing these more than once or 2 times a year. I will probably stick to a few autocross events though just to compete in something as that is a lot less taxing on brakes and other components. Can anybody recommend a rotor that will be a bit more durable. I'd really like to keep it under $100 for each rotor and was probably going to go with an organic pad for street use and swap in a semi metallic pad if I ever do go to the track or auto cross again. I just don't want to burn up rotors again for the once or twice a year hard track day. Thanks for any suggestions and help. I did read through brake sticky. |
The Following 2 Users Say Thank You to Whooosah For This Useful Post: | GeorgeJFrick (04-22-2016), MisterSheep (04-22-2016) |
04-22-2016, 12:24 AM | #2 |
Senior Member
Join Date: Jun 2013
Drives: 2013 Subaru BRZ Limited LR
Location: Milwaukee, WI
Posts: 362
Thanks: 231
Thanked 205 Times in 138 Posts
Mentioned: 5 Post(s)
Tagged: 2 Thread(s)
|
I don't have advice on rotors (I went with DBA rotors); but the rotors I pulled off tonight looked exactly like that (3 track days, 12+ autox).
I'm interested in the replies you get. |
The Following User Says Thank You to GeorgeJFrick For This Useful Post: | Whooosah (04-22-2016) |
04-22-2016, 12:42 AM | #3 |
Senior Member
Join Date: Nov 2012
Drives: Scion FR-S, Ultramarine
Location: Socal
Posts: 390
Thanks: 48
Thanked 100 Times in 79 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
http://www.autoanything.com/brakes/61A5250A0A0.aspx
Centric premiums are a solid choice. Im running them right now, but I have not seen the track with them yet edit: I bought mine from autoanything because of low prices and the free shipping helps with the cost Last edited by Estey; 04-22-2016 at 01:26 AM. |
The Following 2 Users Say Thank You to Estey For This Useful Post: | JazzleSAURUS (04-28-2016), Whooosah (04-22-2016) |
04-22-2016, 01:13 AM | #4 |
Senior Member
Join Date: Feb 2015
Drives: Toyota GT86
Location: Europe
Posts: 919
Thanks: 369
Thanked 554 Times in 301 Posts
Mentioned: 40 Post(s)
Tagged: 2 Thread(s)
|
Was this with the stock brake pads?
__________________
|
04-22-2016, 01:45 AM | #5 |
[insert cool phrase here]
Join Date: Aug 2015
Drives: BRZ Premium
Location: Central Coast CA
Posts: 2,369
Thanks: 709
Thanked 1,558 Times in 930 Posts
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
|
Assuming you still have enough meat on the rotors, you could take them in to an auto part store and have them turned.
__________________
New daily driver - Subaru BRZ Premium
Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged |
04-22-2016, 02:43 AM | #6 |
Senior Member
Join Date: May 2014
Drives: Silver 2013 BRZ Ltd Auto 45,000 mi
Location: Vancouver, WA.USA
Posts: 965
Thanks: 86
Thanked 450 Times in 277 Posts
Mentioned: 60 Post(s)
Tagged: 2 Thread(s)
|
I went with drilled rotors
Quote:
__________________
If I say yes, will that make you think I understand?
|
04-22-2016, 04:38 AM | #7 |
Senior Member
Join Date: Mar 2015
Drives: 2014 GT86
Location: Latvia, Riga
Posts: 4,333
Thanks: 696
Thanked 2,085 Times in 1,436 Posts
Mentioned: 53 Post(s)
Tagged: 1 Thread(s)
|
Yet drilled are not that common on track, if reliability matters. Mostly show car thing. Normal disks are least susceptible to cracking, slotted less, drilled more. Drilled and slotted most of course. I certainly wouldn't actively chose/search for them. Slight extra cooling is not worth to be paid for with less reliability and can be got in better ways, eg. brake air ducting. Even if they look "cooler then flat or slotted", brake subsystem shouldn't be the one, where it's acceptable to have less reliability.
|
04-22-2016, 05:33 AM | #8 |
Thanks
Join Date: Apr 2013
Drives: BRZ
Location: NY
Posts: 4,163
Thanks: 5,989
Thanked 3,100 Times in 1,498 Posts
Mentioned: 38 Post(s)
Tagged: 3 Thread(s)
|
Get a quality blank and some track pads and high temp fluid. I did my first few track days with XP10 and RBF600. So glad I didn't attempt to try stock seeing how many people have issues and waste their track day dealing with them.
I'd probably just go straight to torque rt700 fluid, blanks, and research what track pad you like. I was happy with XP10 but the number of days I was doing I just went to AP sprint kit after 2 sets of pads.
__________________
|
04-22-2016, 05:54 AM | #9 |
Senior Member
Join Date: Oct 2015
Drives: Velocity Orange 86 GT
Location: Australia
Posts: 196
Thanks: 0
Thanked 71 Times in 55 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Thats not as bad as I did on Project Mu 400s but similar. Your pads overheated, lost the transfer layer and tore the shit out of the disc. Get a better set of Pads and it'll clean up over a little bit of time. And start slow and build up because nothing cooks this cars brakes faster than leaving any of the traction control aids on and ABS. Not in that order.
|
04-22-2016, 09:35 AM | #10 |
Senior Member
Join Date: Jul 2012
Drives: 2013 Asphalt FR-S Manual
Location: Whitby, ON, Canada
Posts: 6,716
Thanks: 7,875
Thanked 3,351 Times in 2,134 Posts
Mentioned: 99 Post(s)
Tagged: 1 Thread(s)
|
Are those actually grooves, or just melted pad compound smeared around the rotor? Tough to say from pictures, but that looks more like pad smearing than grooves to me.
If you're getting pad fade (no brakes, but hard pedal) you need better pads (and fluid) to be safe, stick with blank rotors. Drilled rotors are for show cars, drilling removes thermal mass and weakens the rotor.
__________________
Light travels faster than sound, so people may appear to be bright until you hear them speak... flickr |
The Following 5 Users Say Thank You to wparsons For This Useful Post: | BatStig (04-22-2016), Cole (04-25-2016), drewbot (04-22-2016), gramicci101 (05-03-2016), Ultramaroon (04-25-2016) |
04-22-2016, 01:53 PM | #11 | ||||||
Senior Member
Join Date: Dec 2015
Drives: FRS
Location: HNL
Posts: 126
Thanks: 66
Thanked 44 Times in 31 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
|
Yes Im assuming it was stock pads. I bought the car used from dealer with 16k miles. I brought it in the day before track day and it had 9-10mm of pad left all around.
Quote:
Quote:
Quote:
Quote:
Quote:
Also interesting about the aids cooking brakes. Is it because of the torque vectoring using brakes? I did the last session of the day with vsc sport button pushed. I was too chicken to pedal dance everything off but a guy also recommended doing it at the track (another 86 driver). Quote:
They look and feel like grooves dug into the rotor to me, but I'm pretty inexperienced in this kind of stuff. That would be cool if new pads would clean up the rotor. Rotors were smooth as new at the beginning of the day and I didn't notice the grooves until I got home from the track day. Initially I thought I boiled the brake fluid because the pedal went pretty mushy and lost a lot of bite and braking power. The brakes are still mushier and not as much stopping power when I drive on the street probably because the pads are toast and rotor feels like a vinyl record. So I will be replacing very soon. I don't get a good feeling driving around with dying brakes. I would love to eventually get a high end bbk or something similar, but I don't have the funds right now to justify doing that. Also I won't be doing too much hard track days until it becomes a dedicated track/fun car I don't have to worry about getting me around on the daily. |
||||||
04-22-2016, 02:38 PM | #12 |
-
Join Date: Nov 2012
Drives: '13 FRS - STX
Location: SF Bay Area
Posts: 10,366
Thanks: 13,736
Thanked 9,480 Times in 4,999 Posts
Mentioned: 94 Post(s)
Tagged: 3 Thread(s)
|
If the rotors are still in spec for thickness (can't imagine why not, I know people like myself easily see 60k Street miles and multiple track days and seasons of autox on stock rotors without issue) don't waste your money. A new set of Street pads and a set of track pads for your next event. Throw a set of xp10s on there and at the end of your next track day that rotor will have a mirror finish on it.
Mushy feeling is probably a combination of fried OE pad and brake fluid, it'll feel better after replacing both. I experienced the same exact thing after my second track day. Bbk is a waste of money unless you're using up multiple sets of pads per year. |
04-22-2016, 02:38 PM | #13 |
Senior Member
Join Date: Jul 2012
Drives: 2013 Asphalt FR-S Manual
Location: Whitby, ON, Canada
Posts: 6,716
Thanks: 7,875
Thanked 3,351 Times in 2,134 Posts
Mentioned: 99 Post(s)
Tagged: 1 Thread(s)
|
Mushy brakes means you need to bleed them. For the rotors, pull your wheels off and run your thumb nail across the grooves and see how much it catches your nail.
I'd really suggest against drilled rotors, just get quality blanks if these do need to be replaced.
__________________
Light travels faster than sound, so people may appear to be bright until you hear them speak... flickr |
The Following 2 Users Say Thank You to wparsons For This Useful Post: | strat61caster (04-22-2016), Whooosah (04-22-2016) |
04-22-2016, 03:08 PM | #14 |
Senior Misanthrope
Join Date: Sep 2014
Drives: 2015 BRZ Series.Blue CWP
Location: Seattle, WA
Posts: 1,490
Thanks: 1,743
Thanked 1,168 Times in 645 Posts
Mentioned: 20 Post(s)
Tagged: 2 Thread(s)
|
Definitely need a new pad. This is how rotors should look after a track day. I used Cobalt Friction XR2s.
|
The Following 2 Users Say Thank You to kch For This Useful Post: | Packofcrows (04-22-2016), Whooosah (04-22-2016) |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Low car + replacement axles + raising diff advice | JordanWho | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 63 | 04-05-2019 08:47 PM |
DBA Front Rotors | tumbla.jr | Brakes, Suspension, Chassis | 14 | 11-11-2015 10:32 PM |
Timing Chain Cover Replacement - Need Advice | Gen | Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) | 4 | 04-02-2014 12:15 PM |
[WA] FS: GTS Front AND Rear Rotors | stevo_12v | Australia Classifieds | 0 | 01-04-2013 08:43 AM |
Replacement Front Rotors | Texas BRZ | Tracking / Autocross / HPDE / Drifting | 40 | 11-27-2012 03:44 PM |