Hello, I have an infiniti g37x with about 122,000 miles. The VDC off, slip, and brake light are on. My code reader is saying no faults. My brake fluid is fine and tonight while driving I had to press my brake pedal to the ground to stop. What is going on? Please help!

 

Hows your brake fluid level?

 

full.

 

Is this something that happened suddenly or has it gotten progressively worse.

I would start by bleeding the brakes, pedal to the floor means there is air in the line usually.

 

It happened suddenly. I was trying to drive it earlier and noticed my fluid empties but there are no puddles under car so idk where a leak may be.

 

It should be pretty obvious since it sounds like you ruptured a line somewhere and your fluid is low, put fluid in and see where it drips out. Look at each wheel, and look around the cowl area where the master cylinder is.

Get someone else to help look for the leak if you're still having trouble, make sure to use a flashlight.

Personally I like to pull up on concrete that way it's leaving a puddle, in gravel or even asphalt sometimes it's difficult to spot since brake fluid leaks don't typically drip a LOT of fluid.

I suggest start looking around the flexible hose parts of the front calipers, then the rear, those are the most likely points for a rupture.

 

Is it possible for brake fluid to leak into the brake booster on this car? When diagnosing a problem with another vehicle, i got recommendations to confirm my leak wasn't going into the booster. I can't recall if it just fills up inside the booster or ends up getting sucked into the intake. but can explain why one would lose fluid and not see a leak.

 

You would have to have both the rear o-ring on the master cylinder AND the front/primary seal of the booster fail to get fluid up into the vacuum chamber of the booster.

I'm not saying it can't happen, but it's EXTREMELY unlikely.

Far more likely to rupture a flexible line at the caliper.