Alright guys I have been experiencing uneven braking. My car will pull to the left when I brake on flat surfaces. Its most noticeable at higher speeds.
This all started before I did the following:
new tires
new rear rotors/ pads
resurfaces front rotors/ new pads
new springs
new front struts
new camber kit
new stainless steel brake lines
New tie-rod ends

After all that the car still demonstrates the same behaviors when braking.
I am slightly at a loss as the shop hasn't quite figured it out. I am going to try a different shop. The only things I can think of left are possibly:
Calipers(?)
Master cylinder(?)
Brake system piping(?)

Any ideas before I spend money for the wrong things???

 

I chased the same frustrating & expensive thing on a Mustang I bought years ago. Ended up being what you referred to as "system piping". Evidently when the motor came out or the new one was put in, it or somebody bumped a metal line coming out of the ABS unit, located near the firewall, putting a kink in one line that we looked at 100 times but never actually saw it. More of flattened a little bit of the line more than a kink. Which reduced its ability to push fluid at the desired pressure.

What it seemed like was my drivers side was braking too much, but in reality the passenger side wasn't getting enough fluid, which resulted in a pull, uneven wear. Was like a $20 fix several hundred dollars later. I literally went on a replace-this-and-that shopping spree.

The mechanic removed each line from the ABS booster unit and somehow used a pressure gauge on each individual line (not sure 100% on this ) and I think maybe pressure was added at the bleeder valve on each corner or vice versa -- I wasn't there for this & its been years ago. Hope this makes sense & good luck.

 

thanks Bro.. yeah I get what you are saying.. And in fact that's exactly what it feels like.. one side is not getting enough braking pressure

 

I had a similar problem, mine was pulling to the left as the left front wheel was locking up under heavy braking. I personally inspected the brake lines (ss) and then flushed the brake fluid completely. This solved the problem. Maybe there was some debris/blockage in the lines.

 

Well I got new as brake lines installed and still have the issue... Perhaps something between the Ds lines and the master cylinder (?) getting it checked tomorrow.

 

When you say new "brake lines installed", are we talking about the short, flexible section between the body to the caliper? On my Mustang I was referring to these solid lines, one of which had a good kink/flat spot on it :



On the Mustang, both front lines exited the ABS unit, traveled along the back of the firewall, along the transmission tunnel, then forward along the engine cradle to the front suspension of their respective sides. There they connected to the flexible lines to the calipers. I suspect the G37 and pretty much every vehicle route similarly, probably easy to see with the fender liner removed.

Looking forward to seeing you get this one resolved.

 

The brake lines I replaced are the ones leading from the calipers. I will check under the hood from the ABS actuator to see if there is anything that stands out.

I had the guys at Nissan actually take a look and they said that they could indeed replicate the problem so they pressure tested but all lines and said they were operating the way they should. They suspect that my front left caliper is actually causing the issue based upon the car's response.
So I am going to replace the front left caliper and hope that fixes the issue. Its interesting that the more I drive the more that the left side feels "grabby" as opposed to the right feeling unresponsive either that or my brain is wanting to believe that now that it has been told such lol.

 

Finally figured it out.

After replacing both calipers in the front with new ones the issue is resolved. not sure what was going on with them- maybe just age and the pistons weren't responding evenly.. But simply glad to have it fixed.

 

What did you do with the old calipers???
They are rebuildable aren't they?

 

I think they are.. I still have them.. you want them?

 

Hmm, maybe so. I send you a pm shortly when I get some free time.