Cross Drilled Rotors

[landrovermick]

Hey everyone, Im thinking of changing my rotors for these :

https://www.expeditionexchange.com/dba/

Couple of questions :

Has anyone used them?

Does anyone know if you can fit the Ventilated unit DBA086 to a 93 TDI three door that currntly has solid rotor, or do i have to stay with DBA087?

Does anyone have any opinion at all on these units

Regards

Mick

[Pedro_The_Swift]

They look the goods, hey landrovermick,, 8)


I cant see how a ventilated disc would fit,,, :?

and with the size of the pads, I think these would be overkill on the rear.

[shaunp]

No you can't unless you chage the calipers or get some spacers for the middle of them. Disc Brake Aust make some sloted ones that will fit your car. The idea drilled/ stotted is not for cooling but to let the gas out of the pads when the get hot so they don't fade.

[discowhite]

Hey shaunp, isnt your last sentence a bit of a contradiction? :?:

[Pedro_The_Swift]

I think he means, (famous last words,,,)

the slots are not for the disc itself but for the pads,,

but yes its still cooling 8)

[CraigE]

Guy's, I have fitted the crsoss drilled and slotted DBA gold rotors to my 84 RR. They are a fairly easy fit for anyone partially competent in DYI mechanics. The vented ones will not fit without some modification or a complete vented disc upgrade. You may be able to get such a set up off a later model wreck and use new rotors and pads. The cross drilled and slotted ones allow gas build up to to escape stopping brake fade, and they do have some cooling benefits as they create air flow through the rotor. Check out DBAs website for info. Last time I looked the rover ones were not liste correctly, but you can get them. There is some debate as to wether cross drilled and slotted rotors should be used on 4wds, due to the possibility of mud clogging the holes etc, and the possibility of some slight cracking around the holes. I have had mine on for 18 months now and they show no signs of fatigue or damage. They give slightly better braking, eliminate brake fade and are running cooler. The cheapest place I found to purchase them was at Discbrakes.com based in Sydney. Any way best of luck.

[shaunp]

What I ment was that the slots are not to cool the disc but to allow the gas that is produced when the pads get really hot to escape. This delays the on set of fade as the gas pressure actually holds the pad off the disc. Drilled rotors use the same idea but do offer some disc cooling as well, some drilled discs crack if you cool them quick like driving into a creek. Ultimatly fade will be determined by the pad material I reckon. For example DS11 material dosen't fade but it dosen't work either until it is hot and pedal pressure is increased all the time. When I raced my Super charged MGA I would use these for circuits but use normal pads for hilclimbs or sprints where you only used the brakes a couple of times and wanted them to work at the first corner.

[landrovermick]

Hey Im glad you bought up the cracking issue , I got my first quote today, but I was quoted on the slotted only rotors, as the bloke said the cross drilled ones tended to crack between the holes - under extreme use....hmm 200tdi disc rarely towing dunno if that rates as extreme in any circumstances, he did mention that Supercars only use slotted now, but I had a feeling that it had to do with the profit they make, the sloteds were a brand I didnt know, they were plain steel ont anodised and COst $157 each

still waiting on a mate to get back with a quote for the dba units....

Mick