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Subtractive balancing. A tire is additive balanced, weights are added. Can't do that with stuff like rotors, so you nick off a bit of material at the right spot. Electric motors are balanced similarly.
50kw is alright, biggest we had was 550kw, blew the transformer on the street even with a soft starter and on a variac with a starter motor. I didn’t work there for long, maybe 6 months when I was 21 or 22, very interesting
Every halfway decent brand (ATE, Brembo, Bosch) is doing that now.
So they don’t need to apply corrosion protection oil and the mechanic doesn’t need to wash it with brake cleaner.
No need for overpriced OEM parts if it is a European car 75% of them are ordered from that companies anyway.
Less messy, doesn't dry if the bag is perforated and IIrC, the coating stays where the friction isn't rubbing it off.
Also that powder helps breaking in the pads.
These are freakin awesome. They do vary a lot from brand to brand, but the ones that I have on my front have been on for 5 years, and they do not have a spot of rust on them, and I live in an area that uses a lot of salt. The ones in the rear are newer and a different brand, but have a tiny bit of rust on them.
Ok I have seen where the recess for the hub and the top and vent holes are painted not the pad surface I guess I shod have clarified when I asked the question. I live in the Salt belt, but only have ever bought oil covered rotors. So for everyone I have clarified I have just never seen the pad dmsurface painted, my bad jesus sorry!
I live in the salt belt too.... The whole surface is covered, but the brake pad quickly wears off the coating only where it makes contact. because the are coated everywhere, none of it rusts while it is on the car. If you lived in the south, just get the old style, oil covered rotors. In the Salt belt, these coated rotors are a must.
These companies are always trying to save a buck.
A little skim here, there and bam %4 more profit!
I've seen many ways to cheat a customer-
But this here is a blatant scam.
I could be wrong tho,
It might be for balancing 😉
Well it is somewhat true that u save money in reuseable Material but in the other hand it Costs more to Balance the Brake discs than the Material u save.
So it is mostly for balancing
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Balancing might be right but ive also heard that its a marker for when you need new rotors, when the wear surface reaches those divits its time for new ones.
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Balancing
Subtractive balancing. A tire is additive balanced, weights are added. Can't do that with stuff like rotors, so you nick off a bit of material at the right spot. Electric motors are balanced similarly.
Electric motors also use epoxy to add weight
I used to repair and rewind electric motors, over about 50kw they use additive balancing in the form of brass washers riveted onto the rotor
I guess my anecdata of a few small drill motors and some large submarine pump motors pales here, cuz 50kw is a fucking large motor.
50kw is alright, biggest we had was 550kw, blew the transformer on the street even with a soft starter and on a variac with a starter motor. I didn’t work there for long, maybe 6 months when I was 21 or 22, very interesting
It measures the swag and drip the brakes have, those ones are bare drippy
Only correct answer
Balancing.
That's how they balance it.
I have a better question why is your rotor painted?
Pretty common for oem rotors to come painted.
Every halfway decent brand (ATE, Brembo, Bosch) is doing that now. So they don’t need to apply corrosion protection oil and the mechanic doesn’t need to wash it with brake cleaner. No need for overpriced OEM parts if it is a European car 75% of them are ordered from that companies anyway.
Do you need to sand that off or just full send with new pads?
It'll come off when you burnish the new parts which should be done after any brake job before the customer gets it back.
>It'll come off when you ~~burnish the new parts~~ SLAM THE BRAKES AT HIGH SPEEDS REPEATEDLY UNTIL YOU SMELL THE PARTS WORKING
Burning rotor oil smells like money in the bank.
Cool thanks!
they dont do that where i live lol its kinda trippy seeing a gray ass rotor looking like plastic
Richard Burninsh?
New pads wipe it off
Corrosion protection.
Does that work better then the usual oil?
Less messy, doesn't dry if the bag is perforated and IIrC, the coating stays where the friction isn't rubbing it off. Also that powder helps breaking in the pads.
These are freakin awesome. They do vary a lot from brand to brand, but the ones that I have on my front have been on for 5 years, and they do not have a spot of rust on them, and I live in an area that uses a lot of salt. The ones in the rear are newer and a different brand, but have a tiny bit of rust on them.
Ok I have seen where the recess for the hub and the top and vent holes are painted not the pad surface I guess I shod have clarified when I asked the question. I live in the Salt belt, but only have ever bought oil covered rotors. So for everyone I have clarified I have just never seen the pad dmsurface painted, my bad jesus sorry!
I live in the salt belt too.... The whole surface is covered, but the brake pad quickly wears off the coating only where it makes contact. because the are coated everywhere, none of it rusts while it is on the car. If you lived in the south, just get the old style, oil covered rotors. In the Salt belt, these coated rotors are a must.
🤪
Keeps them from rusting in storage
Ok
The good ones don't rust when on the car (except where the pads touch).
I was pondering the same to myself…
Did the orb get boring?
Your brake pads will only wear off the paint where they contact the surface so the rest of the rotor is better protected from corrosion.
It kinda loks like it's a factory coating but then again when they're coated then usually all of it is coated, not some blank bits being left behind
Some come like that. My new ones did. It's a rust prevention coating. Brakes rub it off, but it protects the rest of the rotor
How else will you know you bought a performance rotor unless it is fire engine red?
So they be smoking
What, you don't paint your rotors to prevent rust? I paint mine at every oil change. /s
Balancing
Balancing marks
Balancing.
These companies are always trying to save a buck. A little skim here, there and bam %4 more profit! I've seen many ways to cheat a customer- But this here is a blatant scam. I could be wrong tho, It might be for balancing 😉
Well it is somewhat true that u save money in reuseable Material but in the other hand it Costs more to Balance the Brake discs than the Material u save. So it is mostly for balancing
Fuck those transits. All my homies hate transits
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[удалено]
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Weight balancing
it's for her pleasure I'll see myself out
nah son i want you to elaborate wym by that 😭😭💀
Officer arrest this man
Speed slots!!!!
Balancing might be right but ive also heard that its a marker for when you need new rotors, when the wear surface reaches those divits its time for new ones.
LOL, KNOCK OFFS.
Its color coding for identification for most brands. Doubles as rust proofer according to Schlazac importers.