they are floating if im not mistaken, meaning they are tighened by the wheel nuts. i assume if his wheel is on, the rotor is on ok.

Besides that, if they weren't on correctly, there'd be a lot of feedback through the steering wheel.

Not necessarily. Yes, they are floating but caliper is not floating (in the sport package). So you could have slight rotor run-out from rust on the hub and not necessarily feel it under braking as much as you would with a floating caliper.

Is possible that when they installed the rotors. The brakeline wasn't
Properly bled so now when the brake is relased the trapped air in the line has
Not allowed the brakes to re open properly?
Jus a thought?

If that was the case, then there'd have to be a leak somewhere. AFAIK, air can't "form" inside a brake line or caliper unless something allows it.

Granted, over time, the pistons will let microscopic amounts of air through, or, if you boild the brake fluid it could get gasses built up, but considering he changed the rotors and it started happening...maybe it's a defective rotor? (crazier things can happen!)

Put the old ones back on, and see if the problem persists?

fitment issue?

There are several likely candidates for the scraping sound:

1. Your parking brake shoes are not centered and are rubbing on the inside of your rear rotors. (The 370Z uses a "drum-in-hat" parking brake design, where the rear rotors double as parking brake drums.)

2. Something is not right with the pads or the installation of them.

3. When you installed the rotors, you inadvertently bent the rotor dust shield, so it's scraping against the inboard side of the new rotors.

You can test these theories. The next time you start hearing the scraping sound, gently pull the parking brake lever to see if that changes or eliminates the sound. (Do this carefully and with your finger on the button, so you can release the parking brake quickly.) If it has no effect at all, then theory 1 is dis-proven.

Next, gently depress the brake pedal. If the sound stops when the brakes are applied, then reappears when they are released, there's something going on with the brake pads. Pulll them out and inspect for anything unusual. Like, did you install one backwards? (No insult intended - this is more common than you think!)

To see if it's the dust shield, you'll want to put the car up on a lift or jackstands and pull the left rear wheel. Then use a flashlight to see if you can see how much of a gap there is between the rotor and the dust shield. If it's really tight, use a couple of large screwdrivers or small pry bars to bend it back a little, making sure you're not simply moving the problem from one part of the dust shield to another.

Hope this helps!

I though the parking brake only engages the rear brakes?

+1, I just changed the brakes on my Civic a couple weekends ago, it scraped and "rubs" and makes all kinds of noise - until they get mated up...

They don't make as much in the way of wierd noise now. I imagine with anything more than standard-issue semi-metallic's and plain/smooth new rotors, the noice would be even more-so.

That is correct, and that's where he is having his problems.

On another note, glad you found the forum Dave! I wound up ordering those brembos I was discussing with you through my wholesale account at tire rack.

A guy on the M45 forums complained of the same noises, turns out the 4 bolts that hold in the hub bearing to the spindle actually were backing out and 2 were completely backed out. this was letting the hub wiggle where the spindle was stationary causing the scraping noise. Not sure what caused it but it's worth it to check yours.

Oh, btw - The 2006 Infiniti M45 shares the same hubs as the 370z

Thanks for the advice :tup: I have checked all these points, and that wasn't it. It seams to pretty much have disappeared now, I've got about 3000 miles on them since the install, the only time I can hear it is when lightly applying the brakes, but as soon as more pressure is applied, it goes away. When they were first installed the one side would make the noise just driving or coasting. I think there was/is a high spot on the pad or rotor that has now worn down. I've just learned to live with it. :-)

thx for updating us

Exactly my thoughts..

This can be true as well, but it is unlikely. You would have wheel vibration as well.