DBA 2-piece + Carbotech pads, but problem
 

Last night I installed the DBA-5000 series front rotors and Carbotech 1521's. When I got home and looked at the rotor, it looked like the pad was not making full contact with the whole surface of the rotor. Should it be, or is this normal?

http://i890.photobucket.com/albums/a...4/IMG_4480.jpg

http://i890.photobucket.com/albums/a...4/IMG_4481.jpg

http://i890.photobucket.com/albums/a...4/IMG_4483.jpg

Normal. Be ready for a ring if rust in the no contact area. Try Z1's next time.

/thread

and here's how they look about 1 week after being installed. I wish someone would have said this is what to expect:

http://i890.photobucket.com/albums/a...4/IMG_4517.jpg

http://i890.photobucket.com/albums/a...4/IMG_4516.jpg

very disappointed...I was under the impression DBA made some of the best brake rotors on the market.

Just by the tiny slots you can tell they're not so great

What's wrong with them?

I agree, what is wrong ??

Please, enlighten us on this fine observation and engineering knowhow!!!

Tracy Ramsey

I just wanna know why these rotors arent cut down more where the pads don't make contact or at the least zinc coated

Sorry, there is no engineering to it at all. Personally i have never seen slots that small on a rotors ever, so just from the looks of the DBAs it looked sorta fishy ya know.

it isn't the fault of the rotors that the pads aren't big enough to cover the entire rotor, and I suspect that these rotors are appropriate for more that just the Z. The pad contact area appears to me to be very similar, if not the same, as the stock rotor contact area.

Tracy Ramsey

I use these rotors on an 1100kg 540 hp modified production sports car and they work just fine. Rotors are cold-fired before use and I get a full season out of each set which is less than half the price of AP Racing rotors.

If you are concerned at the aesthetics then learn to live with it, or go back to OEM rotors.

The slots are engineered to provide the minimum space for gases released from the pads during hi-speed stops

In terms of rotor ring design, DBA makes a number of rings from one source casting and these rings are then machined for 332 OD all the way up to 356mm OD.

These rings need to accommodate centre bores from 190 to 200mm and most of these sizes have a common rotor mount PCD of 215.9mm and need to accomodate both 10 and 12 bolt mountings.

The inner face ID varies between 225mm to 231 mm

A common base ring reduces the cost for a number of fitments.

I can tell you that one design objective was to provide the minimum material removal to provide sufficient slot-space to accommodate gas released during repeated high speed stops when rotor temps are likely to reach 900 DegC.

As for a comment about zinc-plating to avoid rust in an earlier thread .... pulleeeez .... zinc coating has absolutely no role in this place

It has all been designed ... if you don't care for the aesthetic, choose another product, but these rotors "work".

You must work for DBA

Nope ... no affiliation ..... just lots of experience going back 20+ years

As for slots no longer being necessary and/or only required with really really crap pads, lets just agree to differ

wonder if there's an option to use taller pads?