I have an 09 G37x Coupe and we have the same brakes, 320/307 rotors. I just installed the POWERSTOP Z26 brake kit and it's very good. You'll need more brake part lube than they give you but other than that the kit is really nice and definitely worth it, carbon ceramic pads last way longer.
I have that kit on my 2013 A6 and have a set waiting to go on my 2011 S5. I would highly recommend, great quality, have used them on many different vehicles, best bang for buck.
I have these on my lifted jeep on 35s (the tow and haul model) and they the best stock size brakes you can get without having to get a big brake kit from mopar.
I just installed PowerStop z23 kit myself. The breaks are great plenty of stopping power but the initial bite of the pads are different. Also almost no brake dust.
Last one lasted me 70k miles roughly. Rotors and pads. Solid choice.
Put them on my Mercedes back in September. Absolutely no complaints. Plus way less brake dust.
I redid all four on my 2014 A4 allroad. There was. Virtually no brake dust and no squeak or squeal with excellent stopping power.
Ya I had them on my a3 and it was dramatic difference than oem. Only down side is slotted and drilled make noise when you brake hard with them.
So I just got my powerstop kit installed yesterday. It was $355 from autoparts warehouse and they threw in free shipping. The kit looks pretty good the nickel plating looks very clean but they don't look as agressive as some of the other kits I've seen. The install was not bad at all although I ran into a snag resetting the rear calipers (I didn't do my homework on what tool to reset them with but I eventually got some help). On my first drive I was not impressed with the stopping power of the ceramic pads and the slotted cross drilled rotors (I was thinking it would have this incredible improvement because powerstop claims the pads don't need to be seated to be at peak performance). I beg to differ they were no different than my oem brakes at all yesterday while driving but after having put about 100 miles on them I am starting to see a lot of improvement in my stopping distances without having to mash the pedal. The pads were pretty noisy at first but today are dead quiet (unlike my oem pads). The pedal doesn't feel any different as far as weight but I don't have to press in on it as much to make sudden stops (I thought I was going to see my lunch again today while in Charlotte traffic at one point). Overall I think it isn't a bad upgrade for somebody on a budget like me who wants to have more performance out of your brake system that functions as an everyday driver or could be used on an autox day. I think I'm going to try it this year . I will try to post some pics of the car with the kit installed and keep you guys updated on how the kit feels if there is any changes over the next few weeks or any brake fade.
I just replaced my rear pads (Powerstop) 3 weeks ago and they already have excessive rust. I know that rust is normal on all brake drums, but my front ones which are still original, don't show a tremendous amount of rust.
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