can anyone tell me the pro's and cons of each? I need to get 2 new front rotors for my Z since destroying mine at Mallala a few weeks ago. I was planning on going for DBA slotted rotors, but not cross drilled. Been told that cross drilled sin't needed, and that the drilling can weaken the rotor. Can anyone confirm this? What is best recommended for everyday street driving, but track use on the odd occassion?
UAS 324mm DBA slotted "Kangaroo Paw" vented discs and Kevlar Pads. I've been using them for several weeks, and the brakes are brilliant:YD Best money spent on my Zed since buying it 4 years ago. Cheers Lloyd :-Z
DBA is unlikely to be able to> provide the caliper spacer required to carry-out this mod, but obviously they will have the discs.Cheers mate Lloyd :-Z
Slight ticking noise with slotted? I was wondering if people with slotted rotors get a faint ticking sound when driving / braking?
Never been aware of any unusual> noise. My original DBA Gold were cross-drilled and slotted, the UAS DBA's are slotted only, both were a big improvement over stock discs.Cheers Lloyd :-Z
the DBA series 4000 are available slotted or slotted and crossdrilled, if you plan on doing occasional motorsport dont get the crossdrilled as they are prone to cracking.
Yes, I do >>> very faint - I hear it more when driving than when braking, and more noticeable when driving where a concrete median strip barrier is in place for the sound to bounce off. I have EBC slotted front discs.
do the stock calipers completely cover that rotor i.e. does any of the brake pad hang over the edge of the rotor? Also are the caliper spacers DOT approved with relevant engineering certificates etc?
Ive decided to get the stoptec kit 332mm 2 piece discs, 4 piston calipers, braided lines, pads and Motul fluid - $1750US from Coz at concept Z. So if anyone is interested in my (hardly used) DBA 4000 280mm rotors, stock nissan calipers or half used yellow stuff pads, send me an email.
Depends on the pad used,>> UAS's Kevlar Sport ($150) pads, had an overhang of about1-1.5mm, however, their Kevlar ($80) pads are a slightly different shape (the pad material dips down lower in the mid-section) and there is no overhang. Also, the Kevlar Sport pads were very noisy (too hard for street use).Don't know about DOT approved, but 90% of the mods being used by performance car owners, are marked "off-road use only", no matter who you buy them from.Cheers Lloyd :-Z
Spoke to a PBR engineer.. He said quite plainly that cross-drilled had no real benefit. All it did was make the disc less rigid hence why they crack. They're supposed purpose is to help ventilate keeping the temp down and reduce fading. But because of the position there is no airflow rendering them useless. PBR supplied discs to the V8 supercars and they only used slotted. The main reason they used slotted was as a wear indicator and nothing more. This person recommended that for better performance you need larger diameter discs. That will make the difference. More pistons in your callipers make them wear better and larger pads last longer. Hope this helped.
The main reason for cross-drilling discs> is to allow the quick removal/venting of gases that build a layer between the pad material and the disc. This gaseous layer acts like a lubricant and stops the pads from gripping the disc, thereby reducing the efficiency of the brakes. The slotting also helps this to some degree, but primarily assists in keeping the surface of the disc pad clean, unglazed, and flat, by acting like a carpenters plane, thereby attaining the best possible contact area between disc and pad. Cheers Lloyd :-Z
BRAKES HEY IM KEEN ON YA BRAKES ARE THEY CROSS DRILLED AND SLOTTED CAN U SENT ME A PIC AND THE PADS TOO 0413375531 DARSHIK darshik_biggie@hotmail.com and what sort of price are u looking at
Ive used both... ...of DBA's offerings (the Gold(Slotted and cross drilled) and the Silver(cross drilled)) on my Lancer and have found each rotor to be about as effective as each other. The only difference is that the slotted rotors will last longer as they are not prone to cracking due to being weakened by the cross drills in the Golds. The Golds lasted about a year before cracking all the way through. I've know had the Silvers for about 18 months with only slight surface cracks appearing. I do need to mention that DBA are on the cheaper side of brake rotors and even expensive rotors (including those supplied by Porsche, AMG etc) found on the worlds top supercars do still crack!!!
