[baldeagleman]

Looking at buying an M2 competition. Went to the dealer today and noticed these cracks in the rotors

https://cdn.discordapp.com/attachmen...723_100325.jpg

He insists they are fine and won't need to be replaced but I am skeptical. Car has 23k miles on it and the rotors are worn that bad. I am assuming this means the car has been tracked heavily (not a deal breaker, kind of expected on a car like this). I tried getting 2k off the price to replace the rotors but they refused. What are your guys thoughts on this? Am I crazy for thinking these rotors will need to be replaced soon?

[grinchmas]

Are you able to catch your fingernail in any of the cracks? If not, you're probably good to go for a while. These discs are notorious for developing those cracks even with canyon driving, hard street driving, and not just track use.
I took mine in a few years ago and the dealer had a printout ready to hand me saying that it was normal on "performance brakes" and not to worry. I ended up replacing them with StopTech slotted rotors later due to the frequent track use and peace of mind.

[baldeagleman]

Those darker ones you can catch your fingernail in. I know the brakes aren't completely gone yet but they are definitely more than halfway through their life. Dealer told me the same thing, but these just look too far gone imo.

[allinon72]

Those stress cracks indicate extreme heat for a sustained period of time and the grooving/deposits within the holes suggests that these rotors have seen some shit. Likely tracking.

[baldeagleman]

Yeah I passed on the car and lost my 1k deposit. Really disappointing, I literally had the check from the bank to buy it and everything. Guy said there was a PPI for the car and when I asked him for it he said this

View post on imgur.com

Just really disappointing overall I drove 7hrs to buy this car I wouldn't recommend these guys to anyone.

[allinon72]

Originally Posted by baldeagleman

Yeah I passed on the car and lost my 1k deposit. Really disappointing, I literally had the check from the bank to buy it and everything. Guy said there was a PPI for the car and when I asked him for it he said this

View post on imgur.com

Just really disappointing overall I drove 7hrs to buy this car I wouldn't recommend these guys to anyone.

Now that you're out of the deal, mind sharing a link to the car? Just out of curiosity. Also the salesman is a shithead to send you a message like that so they don't deserve your business. If you put down a deposit via credit card I would dispute the charge.

[pz619]

Those cracks are fine and normal

https://f10.m5post.com/forums/showpo...23&postcount=1

[chris719]

Originally Posted by pz619

Those cracks are fine and normal

https://f10.m5post.com/forums/showpo...23&postcount=1

They are normal to a degree, but I would say that these rotors look like they have seen the track for 24k miles. I'm not sure that's an issue unless the OP wants a car that's not been tracked ever.

[baldeagleman]

Originally Posted by allinon72

Now that you're out of the deal, mind sharing a link to the car? Just out of curiosity. Also the salesman is a shithead to send you a message like that so they don't deserve your business. If you put down a deposit via credit card I would dispute the charge.

I dont want to start a witch hunt, but I can DM you the link if you want.

[baldeagleman]

Originally Posted by chris719

They are normal to a degree, but I would say that these rotors look like they have seen the track for 24k miles. I'm not sure that's an issue unless the OP wants a car that's not been tracked ever.

I mean I expect the car to be beat up and tracked a bit, but the dealer said he replaced the brakes and insisted the rotors were fine (in fact he told me theyd probably never have to be replaced during the life of the vehicle). The whole deal seemed kind of sus to me because of this. Regardless, I'm not trying to bag on the dealership or whatever.

Also, I looked at a dozen or so m2 comps on autotrader and I'd never seen the brakes in that state (all of which had close ups of the brakes). This car doesnt have any close ups of the brakes on the autotrader post (I wonder why). Was a huge oversight by me to not think to check that.

All this stuff combined to make me feel like the deal was sketchy and back out. Maybe it wasnt the right move, but my gut was telling me this was sketchy.

[thegrinchboy]

OP. Don't think they can legally keep your deposit. May want to look into that, minimally on a principle basis.

[baldeagleman]

Originally Posted by thegrinchboy

OP. Don't think they can legally keep your deposit. May want to look into that, minimally on a principle basis.

I'm going to file a chargeback claim with my credit card

[Moflow]

Originally Posted by baldeagleman

I mean I expect the car to be beat up and tracked a bit, but the dealer said he replaced the brakes and insisted the rotors were fine (in fact he told me theyd probably never have to be replaced during the life of the vehicle). The whole deal seemed kind of sus to me because of this. Regardless, I'm not trying to bag on the dealership or whatever.

Also, I looked at a dozen or so m2 comps on autotrader and I'd never seen the brakes in that state (all of which had close ups of the brakes). This car doesnt have any close ups of the brakes on the autotrader post (I wonder why). Was a huge oversight by me to not think to check that.

All this stuff combined to make me feel like the deal was sketchy and back out. Maybe it wasnt the right move, but my gut was telling me this was sketchy.

Here are my rotors with 22K miles and no track days. Plenty of hard driving on back roads and the occasional bedding procedure to try and make them stop squeaking. But never tracked with equivalent miles.

Dirty and missing valve stem caps...but no cracks that I can see. Hope this is helpful.

[allinon72]

Conversely here are mine with 17k, garage queen. The cracking does not mean the rotors need replaced or will spontaneously combust, but it does suggest tracking and a SHORTER rotor life. To be clear there is nothing wrong with tracking the car, that's what it was made for in part, but OP was correct to get the dealer to replace them or get a credit. It sounds like not only did the dealer scoff, they didn't offer any concession whatsoever and then sent a condescending response that the vehicle was sold to someone else.

OP, you probably dodged a bullet all around. There are plenty of clean cars (and dealers) out there.

[Fabb]

Comp rotor after 10 or so track days and 20k miles. Yours for sure been tracked

[COChris]

[IMG][/IMG]

2NH brakes after 7 track days, maybe 10 hours on track. Running Ferodo DS2500 pads, Castrol SRF brake fluid, and titanium caliper shims. 25,500 miles total.

Edit: maybe that was a press car. Went through that jungle looking for my 1M. Or another possibility it was tracked and improperly cooled-down. This also points to it being a press car. Perillo BMW of Chicago has been known to resell them.

[baldeagleman]

Originally Posted by allinon72

Conversely here are mine with 17k, garage queen. The cracking does not mean the rotors need replaced or will spontaneously combust, but it does suggest tracking and a SHORTER rotor life. To be clear there is nothing wrong with tracking the car, that's what it was made for in part, but OP was correct to get the dealer to replace them or get a credit. It sounds like not only did the dealer scoff, they didn't offer any concession whatsoever and then sent a condescending response that the vehicle was sold to someone else.

OP, you probably dodged a bullet all around. There are plenty of clean cars (and dealers) out there.

Best part is that message is only a few hours after I left the same day.

[dls-m2c]

I agree that the car has probably been on the track. The rotors are also probably ok. You would need to make sure that there are no cracks connecting the drilled holes. That is a major failure waiting to happen.

P.S. If you are tracking your car, don't use drilled rotors.

[BigKutta]

All other things being fine, I wouldn't have forfeited a $1000 deposit over this. Could have used that money for new rotors instead of wasting it.

Also, aren't there state laws against non-refundable deposits?

[jritt@essex]

Stress cracks like those in the pics are a result of rapid expansion and contraction of the discs, which is what happens on the racetrack. Discs that are only driven on the street typically don't show that type of wear. Below is an article I wrote on interpreting disc wear. The discs shown in the pics are our AP Racing units, but the same idea applies to any iron brake disc. These pics show you how our customers' discs would progressively crack when beaten on the track repeatedly. They provide an idea about what everything from 'minor wear' to 'throw them out' looks like.


"When is it time to replace my iron brake discs?"

[captain slowly]

Originally Posted by baldeagleman

I'm going to file a chargeback claim with my credit card

Not sure where the car was, but in NYC it is illegal to keep a deposit on a transaction not completed.

As far as the actual car, what year/price/equipment was it?

[Ratcher]

Originally Posted by chris719

They are normal to a degree, but I would say that these rotors look like they have seen the track for 24k miles. I'm not sure that's an issue unless the OP wants a car that's not been tracked ever.

Mine looked much worse at 35.000km - was tracked a lot - and still worked flawlessly. For what's worth

Still went to the track 4 times after this picture was taken as it still had enough thickness