Facts About MKIII Brembo Rotors

[astigracing]

I just want everyone to know that Brembo never made a drilled and slotted rotors for the mark three's. However, they still make blanks. About seven years ago, I used to sell the blanks and took them to the machine shop to have it drilled, chamfered and slotted. If not machined properly, they will eventually crack...trust me...that's why I stopped having them drilled and slotted -legality reason.

 

[supra90turbo]

aight

 

[jimi87-t]

I thought that was common knowledge :dunno:

The only good "drilled" rotors are ones that are cast with the holes, only found on some big brake kits. This is dew to the molecular structure of the metal.

To help understand, think about a piece of wood, (metal also has micro grain like structure) If you drill into the wood you weaken it. If the wood grows with a hole, such as a knot hole, it is stronger around that hole than a drilled hole, because the grain "wraps" around it instead of being cut. Same thing with metal, if it is cast with the holes, the "grain" (or molecular structure) forms around the hole.

Also, A reason for going with the big brake kit is to make up for the lost surface area dew to the holes and slots.

 

[bluemax]

Unless you're racing, or use the brakes on the street like you're racing, you probably won't have a problem with drilled rotors. The rotors are weaker in strength, but unless you heat them up real hot, you shouldn't have a cracking problem. The cracks occur from the thermal stresses.

I got that from a guy that makes brake kits. I got a rotor and pad kit for my wife's car from him.

 

[IJ.]

Even the good ones will crack eventually.....

Look at a well used Porsche and you'll more than likely see tiny cracks forming around the holes.

 

[whudafux]

umm.........Brembo Rotors Cross Drilled and Slotted

 

[tissimo]

umm.........Brembo Rotors Cross Drilled and Slotted

they are brembo blanks drilled by an another company not brembo...

 

[ts_MKIII]

ok so let me get this straight im not Pointing any fingers, but there is a person on here who is selling Brembo rotors drilled slotted etc, so those are just blanks that were drilled by another company?

so then are they worth as much as people ask for them?

 

[mazzer]

TS_MKIII, clean out your pm box

 

[mkIIIman089]

Never knew that they cracked, I always just assumed they could take... well their own design. Kind of makes me glad I went with OEM "blanks".

 

[bluemax]

I don't know about Brembo, but most places buy cheap blank rotors and machine them for each application. That includes drilling and slotting. The blanks are cheap. Machining I've heard can be as much as $80 each for an outside machine house to do it. But that's for a set up of (2) rotors. If you do a batch, it'll be cheaper and I'm sure that price is on the high end. It should be much cheaper if you have a dedicated set up.

I've talked to many people who use drilled rotors and no one has said they have a cracking problem. But that doesn't mean that as IJ pointed out, that you won't have one after many years. My friend who make brake kits and machines rotors told me that cracking is due to thermal stresses. So it makes sense that Porches have cracking problems. Porches are all driven hard. But I guess if you don't deburr each hole, you could have cracking problem because of bad manufacturing.

Anyway, if you're afraid of cracking, at least get the slotted ones. The slots are suppose to keep the face of the pads fresh.

 

[MassSupra89]

ok so let me get this straight im not Pointing any fingers, but there is a person on here who is selling Brembo rotors drilled slotted etc, so those are just blanks that were drilled by another company?

Yes...if you go to the website those rotors were bought from...you have a dropdown menu to select to have the drilling/slotting done, as well as another menu to have them zinc coated I believe. Or you can just buy the blanks, but people go with the drilled/slotted as it's meant for better heat dissipation.

 

[HyRisk]

So the quality of the "brembo" rotors on ebay are pretty much the same as any other generic brand on there too?

 

[HyRisk]

Sorta of topic, but im looking into getting some AP Racing Big Brake. Anyone know how much they run for and where I could find em? hpf doesnt have em... http://rob.carlile.home.mchsi.com/bigbrakes/bigbrakes.htm

 

[tubbie]

So the quality of the "brembo" rotors on ebay are pretty much the same as any other generic brand on there too?

Not quite the same. If you are buying drilled/slotted brembo rotors, you are really getting brembo rotors drilled/slotted. YOur just not getting it drilled slotted from brembo but from joe blows brake shop that drills and slots the REAL brembo rotors. So you are paying a premium for the name.

In all reality, if you never take the car to the track, you will have no problems with ANY brand of rotors drilled or slotted. So buy the cheapest, it's just as good as the most exspensive..... my 3.5 cents.... :bigthumb:

 

[SP 7M]

I've HEARD that Brembo rotors for the MKIII were too thick and would rub excessively on brand new pads. Has anybody else heard this?

I will never buy drilled rotors. I have Powerslot front and rear (rear uninstalled-need to get a socket big enough to remove the big-ass nut) with Porterfield RS4 pads and Goodridge SS braided lines all the way around. Even with the shitty (HI is hell on cars) OEM rear rotors on there, I can't believe how much more braking power I've got. Of course I bled and serviced my brake fluid, too.

 

[whudafux]

I've HEARD that Brembo rotors for the MKIII were too thick and would rub excessively on brand new pads. Has anybody else heard this?

Yes. I put them on mine and the brakes rubbed like a muh fukuh. But after the pads got worn down enough it was fine.

 

[lagged]

So buy the cheapest, it's just as good as the most exspensive..... my 3.5 cents.... :bigthumb:

you must take into account the type of metal that the company uses. materials with a high number of contaminants will be more prone to cracking DUE to heat stress.

toyota or brembo blanks would be fine.

 

[IJ.]

In all reality, if you never take the car to the track, you will have no problems with ANY brand of rotors drilled or slotted. So buy the cheapest, it's just as good as the most exspensive..... my 3.5 cents.... :bigthumb:

Ummm it's about the very LAST place on a car I'd ever go the cheap option....

 

[whudafux]

Ummm it's about the very LAST place on a car I'd ever go the cheap option....

Agreed. Dont cheap out on brakes, steering, etc....