Well I stumbled upon this ebay seller awhile back and just wanted to let everyone know how great they are. I just picked up a set of 2 black anodized 13" Mustang Cobra rotors, slotted and DIMPLED...which is MUUUCH better than drilled, structurally, for only $85 shipped. Yes thats right, $85 out the door. They have great customer service, and a LIFETIME GUARANTEE against warping and cracking. Something that is virtually unheard of! Here's the link:

http://search.stores.ebay.com/BrakeP...335497QQsofpZ0

 

Thanks. That is cheap...I hope the quality is good.

 

I hope so too.....the dimpled is what got me really excited. That is such a rare feature on rotors. It's nice because they have the asthetics and function of drilled rotors without the compromised strength. Also grain structure is not broken, since the holes don't go all the way through the metal. The company had gold zinc plating for other models, but I guess it's not popular so they're phasing it out. The brakes are produced by Performance Plus Brakes, so it's a pretty well known company. Personally, I really like the look of a gold rotor. Oh well, black should look pretty cool.

 

have you recieved them yet?
don't be so happy until you actually have them

 

No, the order was placed today. They were in stock, and the guy I talked to personally went to the "warehouse" and verified that he had some. He took my shipping info and said they'd be on the next truck. We'll see how it goes. They'll probably arrive looking like ovals.

 

If htey work better, which high end cars are running them?

 

Race cars that are allowed to use slotted/drilled/dimpled whatever rotors don't use them. They're for looks. Solid/blank rotors are the way to go. You retain the surface area and if you look around a bit you'll find that metal transfers heat better than air so having more metal would transfer heat better than what little air goes through those slots/holes/dimples. Whoever started the whole slotted/drilled/whatever crap needs their *** kicked.

 

True statement. The only real preformance feature that brakes today have are cooling fins between the rotor surfaces. Even then sometimes it is actually detrimental to the preformance of the brake. Many cooling fins are straight from brake center to outer surface. The only fins that are truly beneficial and sustain rotor life are cast along with the rotor, and curve to the rotation direction of the rotor. That ensures that the rotor doesn't crack between the fins, and also "scoops" cool air in and pushes hot air out.



Some of the only benefits of slots are to help braze the pad, take away the layer of dust that can develop between the pad and rotor, and if the slot extends to the end of the rotor; to help expel dust away from the rotor. There is debate as to wether a slot should go to the end of the rotor or not, both sides have convincing arguments. The only common agreement is that the depth of a slot or dimple should not exceed maximum wear thickness of the rotor.

Cross drilling today is nothing more than asthetic feature, and is usually detrimental to rotor life because it increases risk of cracking. The stress risers created by breaking the grain structure of the metal by drilling through it overcasts any beneficial "cooling" effects the holes can have, especially when it comes to a daily driver. Also, earlier type brake pads used asbestos and also released gasses when they reached higher temperatures, and the holes were supposed to release the gasses and channel them to the inner fins and out the ends of the rotor. This in theory would eliminate the thin layer or gas between the pad and rotor that could affect stopping power. Something that is prevalent on higher end rotors and multi-piece rotors is having a rotor that is cast with the holes already in. This ensures that grain structure follows the contour of the holes and does not sacrifice strength. It is still not really beneficial though. Today's pads do not produce gases...so the need for any type of drilling is nonexistent.

Since asbestos is no longer used, the higher carbon content of pads increases dust produced, so for appearance and cleanliness reasons, a slotted rotor can assist in stopping distance. The dimpled feature is something that is really only asthetic, but is nice because it gives the look of an expensive cross-drilled without sacrificing durability, stress resistance, and temperature warpage. It is only there to collect dust, and look like a thru-hole, even though it is not.

 

traxtar944

Thanks for the info...i always wonder what were the purpose of the cross drilled rotors.

 

Would one of you please post or pm me when you get them and check them out? I am looking to change my rotors and want to know how they work and look for that cheap price.

 

I was looking at my started threads and saw this one that I forgot to follow up on. Just to let everyone know the quality is very good. I really like these rotors and would recommend purchasing from them. If you ask for Lane, and tell him "Matt with the Maxima who needed the Cobra rotors" sent you, LOL, he'll take good care of you for sure. It took awhile to get them, and he actually ended up sending me a free set of Z32 front pads and 94 maxima rear pads for free. They design and develop their own pads and they work very nice with little dusting and no noise so far.... This is definetally recommended!!


New Link:

Brake Planet Mustang Rotors

If there aren't any Cobra rotors for sale...just call the company. Going through the website will price them at $190 for 2, but Ebay has them for $190 for all 4, so you're going to spend about $100 for 2 through that. Still a VERY good price for 13" rotors. Just call, ask for Lane, and take it from there. Good Luck!