Secondly " The RDA and DRB rotors are too hard, with hard pads, the heat build up is too much"

DRB or DBA? Not much on Google for DRB brakes except for a type of Cobra.

Ok, I found a brake guy, who makes brakes for race cars, and builds race cars, and also sells his own brake systems UPC.

I showed him the issue, and what he said made alot of sense.

"The problem with falcons, first is the wheel bearings are small (same used on ford lazers)

The hub is also cast, and the bearings are rolling in the casting, not a second race.

He showed me one.

He said what happens is the undersized bearings get hot and warp the hub face, this inturn transfers a runnout to the disk, and causes pad drag,

Secondly " The RDA and DRB rotors are too hard, with hard pads, the heat build up is too much"

He said you are better off with softer pads, and preferably softer rotors. (I get hardly any brake dust on my front wheels)

He also said he use to sell the 325mm rotors, but they are not that much in demand, so he had none left.

So his advice was get new hubs / bearings (genuine with Jap bearings), new rotors, and softer pads.

Exactly what happened to my old BA falcon..

Yeah I meant DBA not DRB.

I pulled off everything and checked with a dial indicator, regreased calipers slides etc, cut 2 extra groove in pads, every thing is within spec.

Deglazed the pads and rotors, worked ok for a day, and same blue hot spots appeared, and back where it was.

I can only conclude, pads and rotors are just too hard, and don't throw off heat quick enough.

So I stand by my first comment RDA rotors are garbage.

Will try DBA, and hope they at least cool down better, which is the complete issue.

Good luck with that

Update. Tried the newer rda slotted and dimpled rotors that supercede the slotted ones. Much better. 5000 kms and all good so far. And this time they have an anti corrosive coating. Not bad for $170 pair. Bedded in over 2 tanks of fuel have done a few hard stops. No probs.

So RDA discs aren't garbage. Only the cheap ones.

The new ones are the cheap ones. They are now better quality than previous version with no dimples. The machining quality in noticeably alot better also

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If they were so crap why did you get the same brand again?

Because I had a look at the new ones and saw the obvious improvements. The comments all stated the Gold ones were ok. The new version are exactly the same without zinc pasephate and even cheaper than before.

I import a lot from china. So I know how they rapidly increase quality from their premium product lines and pass it onto the higher volume line and therefore drop the price . Still a gamble but it paid off this time. Also using softer pads bendix the calipers dont get anywhere near as hot as before.