I just bought 4 brakes and rotors off amazon for my 2004 G35. I accidentally put in 2006 in the fitment section. However i have a 2004. I was pretty confident there was no difference when I went back and put in 2004 Infinity G35 and got the words, "IT DOES NOT FIT." Now I'm paranoid. Is there a difference?! Shouldn't something that fits the 2006 also fit the 2004 or did they change the specs on the brakes between the years?

This is what I bought. I know it's a lower quality brand that uses oil in the machining process vs dry machining from the greats like brembo, but I've been using these cheaper brands for 7 years now on my other daily drivers and they do just fine. More bite and less fading than OEM stuff for spirited driving. and I don't track the G like I do my corvette so it's not worth spending thousands on a brake setup that will never be put through it's paces. They are cheap enough to just toss the rotors after two pad changes. But fitment??? Did I mess up?

 

Different diameter and thickness. '03-'04 had two options, regular and Brembo, '05+ had I think one option.

 

Adding on to what Cleric said, G's before 2005 had either smaller brakes or Brembo's; IIRC the only way to get Brembos was to have a manual car with the sport package.

For 2005 they swapped to ALL cars having beefier brakes (seriously check out a G's front caliper vs a random car on the road, it's bigger than some SUV calipers I've seen), but also dropped the Brembo's (people didn't like how pricey rotors were.

 

2003-2004 non brembo outer diameter = 296mm

2003-2004 brembo outer diameter = 324mm

2005+ outer diameter = 318mm

There was also a variation in thicknesses but the outer diameter is the easiest to check.

 

Great, So I'm going to have to return them.... well that really sucks.. Anyways, thank you for the information guys.

 

05+ had 320mm rotors and 2 piston calipers in the front.
03-04 base (and 05 AWD) brakes were single piston front calipers, and some little baby rotors.

06 pads & rotors won't fit an 04, unless you swap out the calipers also (which is a common upgrade).

 

It may also be worth finding 05-06 calipers and fitting the rotors you got, as the 05-06 brakes are a lot better than 03-04 non brembo. They can usually be found for cheap and will bolt right up.

 

Calipers and a set of pads for it.

 

where can i buy pads and rotor for brembo brakes?

 

What about these? These might work without having to change calipers.