Brake Rotor Life Cycle (Track Use): Why they Fail, How to Anticipate Failure, and Which I use.

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Using an assortment of iron brake rotors I had laying around or borrowed I talk through the life-cycle of a track-used iron rotor, discuss why they fail, how to anticipate those failures, some tips to extend rotor life, as well as my philosophy on buying rotors. This is mostly applicable for track use, as casually-driven street rotors may eventually wear thin or have other issues prior to failing out-right.
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20 июл 2020

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Комментарии : 27

@3Wheels1Block 4 года назад

Great video! I hope to avoid phase 5 for sure. A video about bedding in the brake rotors would be pretty handy.

@LapoftheWorld 4 года назад

Thanks! I'll put that in the idea stack though that is an activity with some nuance as the process may vary with the pad compound. The HAWK HP+ I run right now are easy to please, but I've heard stories that higher temp compounds can be tricky at times.

@The_Stick 4 года назад

Nice video! I'm curious about your general approach to maintenance before/after track days. Oil changes, brake fluid flushes, alignments, etc. Also, have you found an affordable approach to get your car inspected before track events?

@LapoftheWorld 4 года назад

Most groups I run with allow self tech as long as you have decent experience. Regardless of if I run an event that requires it, I do usually take it to a trusted shop once a year for a second set of eyes. Oil changes 3k miles or every couple of events if I somehow didn't cover the mileage. Brakes get kinda burped before each event to keep fresh fluid in the calipers where it takes the most abuse, alignments again once a season unless something feels funny or funny tire wear. Probably some details, but maybe a good video topic down the road.

@odortiz 3 года назад

with my heavily tracked m3, i can get like 5 years of track on front rotor rings, with a stoptech kit. never lost a rotor to cracking. plenty of pads, though. and if the rotor slot is starting to look shallow, the ring can go to the rear, since the rotors are the same size on my cars with 4-wheel kits. but speaking to that "ting" noise, i was talking with a GT3 driver after coming off the track, and after a few minutes of talking about brakes, we hear a loud click from the corner of the car where he was standing. sure enough, the porsche rotor fully cracked right next to us, while we were talking about it.

@LapoftheWorld 3 года назад

Good data point on the stoptechs. I may eventually go that direction with the NSX... but I suspect that will be driven less by performance and more by OE parts scarcity and a desire to not have to deal with the integral screw-in e-brake when changing rear pads😅

@odortiz 3 года назад

Lap of the World and if you get the 4-wheel kit, all rotor rings and pads are the same. So you can run old pads in the rear, and new pads in the front, and keep cycling them like that.

@user-mf3dk3zo7y 9 месяцев назад

Great video! But you didn't mention scratches and grooves, which are what my rotors have now. So how can I determine the phase if they have scratches and grooves (not deep)? Coz other than those, it seems they are between phase 2 and 3. And is it OK to only change pads at this stage?

@LapoftheWorld 9 месяцев назад

The grooves running around the face are normal. That's like phase 1.5 or something before you start seeing any radial checking/micro cracks. From my experience one can swap pads, they just may take a bit longer to bed in and match the slightly uneven surface.

@user-mf3dk3zo7y 9 месяцев назад

Thanks for the reply! Actually the rotors I mentioned have gone through ~70% of the current pads life, so the grooves are more like 'after track heat cycle pattern' instead of 'not bed in yet' (well, I could be wrong). But it seems they are still OK based on your experience in spite of this?@@LapoftheWorld

@LapoftheWorld 9 месяцев назад

@@user-mf3dk3zo7y yeah, I've had rotors get grooved after going through a whole set of pads and I'll just swap the pads unless the rotors have started micro cracks.

@user-mf3dk3zo7y 9 месяцев назад

Gotcha! Thanks so much!@@LapoftheWorld

@srjt9000 Год назад

What pads do you use and how long do they last relative to the rotors?

@LapoftheWorld Год назад

On the NSX I've been running Hawk HP+. I've had people tell me that's not enough pad, but all data says it is at least on 200tw street tires with a car less than 3000lbs. I typically get 3-ish weekends or like 4-6 total days out of the pads, and probably about 5-6 events out of the rotors. I could probably go up in pad to something a little more robust to get more life, but the expense of the upgrade might erase the "savings" of getting more time out of the pads.

@RoadrunGTI 4 года назад

I’m interested to hear if you’ve had any experience with high carbon blank rotors (like Centric / Stoptech), which are a few dollars more per rotor than the standard auto parts store special. I seem to be able to get a couple seasons out of mine, granted I have some additional cooling.

@LapoftheWorld 4 года назад

I have not run Stoptech, I believe I have used Centrics, although it's been a while. I honestly think if I only did warm-weather events, I probably could get a couple of seasons out of a set of cheap-o's. It's those cold-weather events that usually kill them or at least finish them off if they were already starting to "grain" a little. It would be interesting to do a controlled experiment with a high carbon vs. a bargain-bin vs. a cryo-treated rotor. Maybe I'll stick that in the idea-bin 😁

@RoadrunGTI 4 года назад

Lap of the World That would be a neat test to compare rotors. Keep the videos coming, definitely enjoy your channel. Have fun at the track, I’ll be headed to Dominion Raceway in VA next month, but hopefully this heat breaks before then. 👍

@LapoftheWorld 4 года назад

@@RoadrunGTI Thanks for the kind words! Dominion is a fun track, I made it up there in 2018 and had some good fun.

@captainslav6528 3 года назад

I know the drilled rotors are very prone to cracking but do you feel slots are still slightly more prone to crack than a blank rotor would be I'm having lots of issues with cracking on some slotted rotors and I'm not even on sticky tyres and not driving very hard either at least no where near racetrack pace. I have had blanks before and not seen them crack even out at the race track they didn't crack would you say slots played a part in cracking ?

@LapoftheWorld 3 года назад

Caveat that I'm not an engineer/metallurgist but I suppose any cuts or holes in a rotor surface could add stress risers that could lead to premature cracking. That said, there are a LOT of factors in play. Heavy cars with smaller/lighter rotors will be higher risk, as will any car driven hard in colder climates due to the potential for more rapid contraction off-heat-cycle.

@captainslav6528 3 года назад

@@LapoftheWorld Yeah it's hard to say lots of variables thank you for the quick reply.

@FreestylerAlbert 4 года назад

what about brake cooling ducts? Maybe would worth it for you on track?

@LapoftheWorld 4 года назад

😁 Yes! "tested and approved" lol: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Pu-pRbAkgOI.html

@LapoftheWorld 4 года назад

The real caveat is this: although they help braking performance, there's some chance cooling could hasten cracking in some circumstances because it would shorten the cooling cycle....but other times they might help by keeping peak temps down. Probably a good question for an actual engineer.

@silvergle 4 года назад

I have the same thought about BBK vs blank rotors... I can't stomach spending $200/corner to refresh the rotor rings vs a $60/corner Centric High Carbon blanks on the Z. But, I also only do a couple of track events a year. What pads were you running on those rotors? HP+?

@LapoftheWorld 4 года назад

It would be different if I thought I was struggling for stopping performance, but as-is with my stock motor, relatively light car, I can engage ABS if I'm too heavy on the pedal early in the braking zone, so that tells me that it's the tires, not the brakes that are the limiting factor right now.

@silvergle 4 года назад

@@LapoftheWorld Understood! I don't want for stopping power with the factory Brembos on the Z, but a larger rotor would be nice for helping slow a 3200# car...