This has been bugging me for a couple years now. This was not always an issue. I have searched and searched and spent a fkn long time searching and troubleshooting but still no solution....

So here it is...
Anytime I take an exit ramp that involves me making a sharp right. My Brakes Kick in automatically with out me ever touching the brakes or loosing any type of control. This does not happen when making lefts.

Things I checked
Camber arms bushings.
These were my first suspect but they were all replaced by dealer and I double checked them again this weekend and all bushings seems fine and in the regular position.

Brake lines and calipers
I found 1 caliper brake line to be slightly pinched so I removed caliper on passenger side and rotated it to remove the pinch. This pinch must have happened when I changed out my rotors to drill/slotted a few years ago.

This however did not resolve the issue.

My alignment seems on point, I have gotten the car aligned however the steering wheel is tilted slightly to the left, and the tire makes a noise as if there is bad toe or bad control arm.

I checked all brake sensors, and cleaned them out. This also did not resolve it.

Also checked Wheel Spindle Bearings
Brake Fluid has been topped off.

Any help would be greatly appreciated. Using the car like this for a couple years now and getting scared taking exits fasts is really starting to drive me up a fkn wall. I have a second car so it was just getting push aside I cant take it anymore. Thoughts?

 

Lol mine does the same thing, not 100% sure but it seemed to have started after an alignment... even though the alignment is good. I still have to be taking the turn a little briskly for it to occur. Do you have aftermarket wheels?

 

At first I thought maybe it was the after market wheels so I went back to stock. Doing that made no difference in fact it felt more flimsy. I am now riding on Rays Wheels from a 370Z.

 

Wait...your car brakes for no reason and you have been driving it for a couple of years?? The problem must not be as bad as I read. Good luck trouble shooting.

 

Do you have VDC?

 

+1


what are your tire sizes for front and rear?

 

I have VDC, and yes the brakes kick on for no damn reason. I'll take a turn fast and with out me hitting the brakes still hitting gas... With out loosing any traction... My car starts to pump the brakes for me. Only making rights and yeah man I've been doing this for a couple years. I havent driven the car in a while because I bought a 370Z, but now that car is gone and I want to focus on getting this car rite.

My Tires are as follow They are Rims from a Sport Packaged Nissan 370Z
F: P245/40R19
R: P275/35R19


This has happend on my 20's
This has happened going back to Stocks 18"
This is happening on these 19's

Now it didnt always happen. The only thing I can put together is a couple thousand miles after my brake and rotors where changed out. Alignment has been done several times. Controls arms changed etc....

 

your tire sizes are wrong on your 19's, what size tire did you run on your homie bling bling dubs?

 

I'm not sure how you can say my tire sizes are wrong when they are stock.
This problem also occurred on my stock wheels and tires from the Dealer that never had a problem.
We also have a ton of members running this exact same setup with no problem

Tires on my "homie bling bling dubs" were 245/35/20 275/30/20. Please keep in mind that it did not always happen with the DUBS. I had ridden with those size wheels for about a year and a half before all this problem started.

Wonder what would happen if i completely disengage the abs.

 

 

It's not ABS so disengaging ABS would be a bad thing.

245/35 275/30 and 245/40 275/35 are definitely the wrong size and a problem. The fronts are taller than the rears and that's an absolute no-no on the 350.

Besides incorrect tire sizes other factors can cause VDC to kick in. You could have one or more wheel speed sensors going bad. Worn or mismatched tires could be slipping. One or more speed sensors may have been knocked out of alignment during the brake or suspension work.

 

Thanks for the legitimate response. However... This happened with the BONE STOCK wheels and Tires as well. I have also seen several members with this wheel setup and no problems...

If it did not happen on the stockers I'd be all over this, but it did.
Bad Sensors would cause the car to brake on its own? This seems more legit to me. It's only when pressure is placed on the front left side.

It does not happen going up a hill making a right only right hand turns that place pressure on the left hand side.

 

Try disconnecting the Yaw Sensor that is located just behind the shifter...and see what happens. (many thread on this subject here, just search)

Disconnecting the Yaw Sensor will disable VDC 100% but retain full ABS functionality...many peole do this for track days to prevent the VDC from applying the brakes when drifting and thus cooking the inside (of the turn side) brake pad and rotor.

VDC does this to "save you" because it thinks you are spinning out.

 

I would probably have the bank angle sensor rest at the dealer, could be off.

 

That's the reason i suggested problems with the sensors themselves or worn/mismatched tires. While you may have put the bone stock wheels back on it, were they the original tires too?

One of the functions of VDC is to apply the brakes. VDC is controlled by the computer looking at the rotation rates of all four wheels. If something is out of whack, then VDC can be tricked into kicking in. It's normally seen/felt as the brakes being applied. While there are many things that can cause VDC to activate, from the limited conditions that you're seeing, i'd be most suspicious of a wheel sensor or the yaw sensors/module located in the the center console.

One more obscure thing to check is the steering angle sensor. If it's not aligned properly or is flaky, then it could be confusing the system into thinking the car is making more/less of a turn than it really is.

 

My money is on this.

 

Where would I find the steering angle sensor? I ask because I have taken my car to get aligned twice and my steering wheel is still cockeyed. I thought it was a bad control arm but I checked those and there still new.

I'm going to look into replacing the wheel sensors, and look into pricing for the yawn sensor.

Would the Yawn Sensor make the Check Engine light go on?

 

only the dealer can reset the steering angle sensor. its part of the clock spring.

i'd bet that is the issue as well.

 

Bingo!!!!! The steering angle sensor thinks your wheel is always turned a little if that is the case. When you make a right hand turn, it's thinking the turn is even tighter than the really is so the wheels speeds are not making sense.

Your steering wheel must be locked straight when you get the car aligned.

 

So Go back in for another alignment, front wheels and reset steering angle sensor.

Anyone know a price on this at the dealer?