Ok, It's official.... Axxis ultimate pads suck something awful compared to Hawk HPS's and even OEM... NO WONDER they were significantly cheaper.
I only changed my rotors (OEM, non-drilled\slotted, vented fronts & solid rears) all around and put on the Axxis Ultimate pads. I did not do anything else to the car, so my judgment of their performance shouldn't be affected by any other variables. If anything, the new rotors should make them work better than when I had the HPS pads - in which case I re-used my old rear rotors. I used liberal amounts of brake cleaner and kept the glue on the BACK of the pads. I'll flush my fluid sometime soon, hopefully that will make these shitty pads bearable. I've let them brake in for quite a while, I've driven about 600 highway miles on them, about 350 regular street miles, and about 50 aggressive, "track level" miles on them. Break-in is at *least* 95% done, and hasn't gotten any better in the past week.... I'll definitely update in a while if anything changes
Well, they are quiet and stop the car, but, the braking force is NOWHERE NEAR as linear as OEM or the HPS pads. Pedal feel is really weird. It's almost unpredictable the way they respond according to speed\pedal force and I really can't figure out the curve of speed\vs pedal force. So, every time I brake, I have to adjust my braking force on the fly. It's terrible. My lines\fluid should be perfectly fine since it's braking evenly from caliper to caliper and was working great with my HPS pads although I had a warped front left rotor. Braking with the warped rotor & HPS pads was actually BETTER than the AXXIS Ultimate's if you discount the vibration...
You know what else, They fade like hell. The fade isn't as bad as when the OEM pads or HPS pads faded, but it DOES change that "curve" I was talking about. It has the characteristic of less braking force once everything all gets hot, so it is fade, but it makes the braking force required more linear and "normal" compared to when they aren't hot. It's really fscked up and downright un-f**king-safe... It's like they are track pads and need to be at a higher operating temp, but they have already began to fade at that temperature! Not only are the fade characteristics weird, but they fade MUCH sooner than OEM or the Hawk HPS pads! These are suppose to be for performance street\track pads!
**EDIT: I meant to say they DO fade much sooner than the HPS pads, and at about the same time (if not sooner, like I said) than OEM pads.
Well, they don't make much noise, except when I brake hard in reverse in which case the front pads make this really weird chatter noise & feeling on occasion... so the noise level is a plus... woo.... but if your concerned about noise, get the OEMs cause performance pads are going to squeak unless you have some really nice calipers (brass bushings, etc) and some serious glue on the back of the pads.
As for dust, can't really comment on that as I haven't washed my car in a while... they are ceramic so they should dust a bit less but it looks like they are just as bad as OEM pads.... which is pretty bad.
To be honest, I am VERY tempted to buy some EBC Green Stuff or even go back to my current favorite of the three that I've tried: Hawk HPS's. Seriously, They suck that badly. I'll gladly throw this $100+ set of pads out the window if they keep working like this.
So far, I've had first hand experience of (IE: installed and used all the way): 2 sets of OEM pads, 1 set of Hawk HPS with new front OEM rotors (old rear rotors), and 1 set of AXXIS Ultimates with new OEM rotors all around (that's right, I replaced my front 2 rotors after using one set of pads on them, front left was warped to shit)
When I say set, I replaced all 8 pads at once.
OEM's: Quiet, linear feeling, fades a little soon for serious track use, predictable, but dusts like fuck. Good cheep pad.
Hawk HPS: Excellent street\aggressive\track pad. Less dusty than OEM, but still dusty. They can squeak like hell once you heat them up unless you glue the piss out of them and possibly get brass caliper bushings. -Very similar feeling to OEM, but lasts much longer and bites much harder. WELL worth the money
AXXIS Ulitimates: Shit. All the things you don't want in a brake pad except they are quiet when the rotors are spinning forward.... and um..... well, they do manage to stop the car... I'd buy em if I was a crackhead who had a bmw, but only if a full set could be had for $5...