So I changed over to the dual piston calipers, pads and rotors from a 2005 to my 2003 Infiniti G35 Sedan with the 6MT. After I bled the brakes several times, THE PEDAL STILL WENT RIGHT TO THE FLOOR! I have been bleeding the air out of these for 3 days now and still no pedal! If you pump the pedal repeatedly it firms up, then you let off, wait a second or two, then you press the pedal again and it goes right to the floor! My car does have VDC, and ABS so maybe that's why its not working? Worth mentioning for someone who really knows these cars!

I manually bled, vacuum bled, and I even got my buddy to pump the calipers all the way out and then I bled them while I pushed them back in!

I also bench bled the master cylinder, bled the ABS module, and bled the brakes all around again and it still does the same thing!

So I pinched off the brake lines with special clamps and the brake pedal stayed firm. Then i released one side and the pedal still dropped, then the other and the pedal dropped.

No leaks as I checked several times!

I cant see it being my booster cause before I did the swap, everything worked great!

I put the original brakes back on and bled the whole system again and the brakes work fine!

No idea whats going on!

Can anyone help???!!!

 

Brake booster

I had to do that for a brembo swap (2003 G35 brembo to a 2007 350z) I did for someone

 

Swap out the brake booster from the 2005 model and put it into my 2003?

 

^ Yes

I would swap the master cylinder and brake booster

 

So I double checked the part numbers and they are not the same for the booster from the 2003 to the 2005?

I am just wondering if these mount up the same?

 

Also check that you put the rear calipers on the right side, if you didn't then the bleeder screw will be on the bottom instead of the top. Only know this because it happened to me and a friend.

 

I have only done the swap over of the front! Do you think I should swap over the rears?

 

No, the fronts only fit on one side or the other, the rears will fit on either side technically. That wouldn't/shouldn't have anything to do with it. Not sure what to tell you to try next.

 

So this whole thing just doesn't make sense!

I just realized that I didn't check to make sure the calipers were on the right side! Maybe they were on the wrong side and that would put the bleeder screw at the bottom of the caliper so that would not allow me to bleed them out!

I'm gonna remount them and make sure they are on the right side, I will let u guys know when I'm done!

Thanks for all your help guys! Nice to see a forum that helps out the average gear head!

 

So don't laugh to hard but I went and made sure I put the right caliper on the right side and bang, it works great!

I guess u over look a lot of stuff when ur in a hurry!

 

Glad that worked, I know how frustrated we were for 2 days!!